diff --git a/Modules/Net/main.swift b/Modules/Net/main.swift
index 5f032165..02cd1e97 100644
--- a/Modules/Net/main.swift
+++ b/Modules/Net/main.swift
@@ -28,11 +28,8 @@ public struct Network_interface {
 }
 
 public struct Network_Usage: value_t {
-    var download: Int64 = 0
-    var upload: Int64 = 0
-    
-    var totalDownload: Int64 = 0
-    var totalUpload: Int64 = 0
+    var bandwidth: Bandwidth = (0, 0)
+    var total: Bandwidth = (0, 0)
     
     var laddr: String? = nil // local ip
     var raddr: String? = nil // remote ip
@@ -44,8 +41,7 @@ public struct Network_Usage: value_t {
     var ssid: String? = nil
     
     mutating func reset() {
-        self.download = 0
-        self.upload = 0
+        self.bandwidth = (0, 0)
         
         self.laddr = nil
         self.raddr = nil
@@ -142,7 +138,7 @@ public class Network: Module {
         
         self.popupView.usageCallback(value!)
         if let widget = self.widget as? SpeedWidget {
-            widget.setValue(upload: value!.upload, download: value!.download)
+            widget.setValue(upload: value!.bandwidth.upload, download: value!.bandwidth.download)
         }
     }
 }
diff --git a/Modules/Net/popup.swift b/Modules/Net/popup.swift
index 58bb49eb..acb42dc6 100644
--- a/Modules/Net/popup.swift
+++ b/Modules/Net/popup.swift
@@ -306,12 +306,12 @@ internal class Popup: NSView, Popup_p {
     public func usageCallback(_ value: Network_Usage) {
         DispatchQueue.main.async(execute: {
             if (self.window?.isVisible ?? false) || !self.initialized {
-                self.uploadValue = value.upload
-                self.downloadValue = value.download
+                self.uploadValue = value.bandwidth.upload
+                self.downloadValue = value.bandwidth.download
                 self.setUploadDownloadFields()
                 
-                self.totalUploadField?.stringValue = Units(bytes: value.totalUpload).getReadableMemory()
-                self.totalDownloadField?.stringValue = Units(bytes: value.totalDownload).getReadableMemory()
+                self.totalUploadField?.stringValue = Units(bytes: value.total.upload).getReadableMemory()
+                self.totalDownloadField?.stringValue = Units(bytes: value.total.download).getReadableMemory()
                 
                 if let interface = value.interface {
                     self.interfaceField?.stringValue = "\(interface.displayName) (\(interface.BSDName))"
@@ -345,7 +345,7 @@ internal class Popup: NSView, Popup_p {
                 self.initialized = true
             }
             
-            self.chart?.addValue(upload: Double(value.upload), download: Double(value.download))
+            self.chart?.addValue(upload: Double(value.bandwidth.upload), download: Double(value.bandwidth.download))
         })
     }
     
diff --git a/Modules/Net/readers.swift b/Modules/Net/readers.swift
index 9eb0de19..40ed2653 100644
--- a/Modules/Net/readers.swift
+++ b/Modules/Net/readers.swift
@@ -24,15 +24,11 @@ struct ipResponse: Decodable {
 }
 
 internal class UsageReader: Reader<Network_Usage> {
-    typealias BandwidthUsage = (upload: Int64, download: Int64)
-    
     public var store: UnsafePointer<Store>? = nil
     
     private var reachability: Reachability? = nil
     private var usage: Network_Usage = Network_Usage()
     
-    private var shouldReportSelectedInterfaceBandwidthOnly = true
-    
     private var primaryInterface: String {
         get {
             if let global = SCDynamicStoreCopyValue(nil, "State:/Network/Global/IPv4" as CFString), let name = global["PrimaryInterface"] as? String {
@@ -51,6 +47,12 @@ internal class UsageReader: Reader<Network_Usage> {
         }
     }
     
+    private var reader: String {
+        get {
+            return self.store?.pointee.string(key: "Network_reader", defaultValue: "interface") ?? "interface"
+        }
+    }
+    
     public override func setup() {
         do {
             self.reachability = try Reachability()
@@ -73,23 +75,108 @@ internal class UsageReader: Reader<Network_Usage> {
     }
     
     public override func read() {
-        let currentUsage: BandwidthUsage
-        if shouldReportSelectedInterfaceBandwidthOnly {
-            currentUsage = interfaceBandwidthUsage()
-        } else {
-            currentUsage = allProcessesBandwidthUsage()
+        let current: Bandwidth = self.reader == "interface" ? self.readInterfaceBandwidth() : self.readProcessBandwidth()
+        
+        // allows to reset the value to 0 when first read
+        if self.usage.bandwidth.upload != 0 {
+            self.usage.bandwidth.upload = current.upload - self.usage.bandwidth.upload
+        }
+        if self.usage.bandwidth.download != 0 {
+            self.usage.bandwidth.download = current.download - self.usage.bandwidth.download
         }
         
-        self.usage.upload = max(currentUsage.upload - self.usage.upload, 0)
-        self.usage.download = max(currentUsage.download - self.usage.download, 0)
+        self.usage.bandwidth.upload = max(self.usage.bandwidth.upload, 0) // prevent negative upload value
+        self.usage.bandwidth.download = max(self.usage.bandwidth.download, 0) // prevent negative download value
         
-        self.usage.totalUpload += self.usage.upload
-        self.usage.totalDownload += self.usage.download
+        self.usage.total.upload += self.usage.bandwidth.upload
+        self.usage.total.download += self.usage.bandwidth.download
         
         self.callback(self.usage)
         
-        self.usage.upload = currentUsage.upload
-        self.usage.download = currentUsage.download
+        self.usage.bandwidth.upload = current.upload
+        self.usage.bandwidth.download = current.download
+    }
+    
+    private func readInterfaceBandwidth() -> Bandwidth {
+        var interfaceAddresses: UnsafeMutablePointer<ifaddrs>? = nil
+        var totalUpload: Int64 = 0
+        var totalDownload: Int64 = 0
+        guard getifaddrs(&interfaceAddresses) == 0 else {
+            return (0, 0)
+        }
+        
+        var pointer = interfaceAddresses
+        while pointer != nil {
+            defer { pointer = pointer?.pointee.ifa_next }
+            
+            if String(cString: pointer!.pointee.ifa_name) != self.interfaceID {
+                continue
+            }
+            
+            if let ip = getLocalIP(pointer!), self.usage.laddr != ip {
+                self.usage.laddr = ip
+            }
+            
+            if let info = getBytesInfo(pointer!) {
+                totalUpload += info.upload
+                totalDownload += info.download
+            }
+        }
+        freeifaddrs(interfaceAddresses)
+        
+        return (totalUpload, totalDownload)
+    }
+    
+    private func readProcessBandwidth() -> Bandwidth {
+        let task = Process()
+        task.launchPath = "/usr/bin/nettop"
+        task.arguments = ["-P", "-L", "1", "-k", "time,interface,state,rx_dupe,rx_ooo,re-tx,rtt_avg,rcvsize,tx_win,tc_class,tc_mgt,cc_algo,P,C,R,W,arch"]
+        
+        let outputPipe = Pipe()
+        let errorPipe = Pipe()
+        
+        task.standardOutput = outputPipe
+        task.standardError = errorPipe
+        
+        do {
+            try task.run()
+        } catch let error {
+            os_log(.error, log: log, "read bandwidth from processes %s", "\(error)")
+            return (0, 0)
+        }
+        
+        let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
+        let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
+        let output = String(decoding: outputData, as: UTF8.self)
+        _ = String(decoding: errorData, as: UTF8.self)
+        
+        if output.isEmpty {
+            return (0, 0)
+        }
+
+        var totalUpload: Int64 = 0
+        var totalDownload: Int64 = 0
+        var firstLine = false
+        output.enumerateLines { (line, _) -> () in
+            if !firstLine {
+                firstLine = true
+                return
+            }
+            
+            let parsedLine = line.split(separator: ",")
+            guard parsedLine.count >= 3 else {
+                return
+            }
+            
+            if let download = Int64(parsedLine[1]) {
+                totalDownload += download
+            }
+            if let upload = Int64(parsedLine[2]) {
+                totalUpload += upload
+            }
+        }
+        
+        return (totalUpload, totalDownload)
     }
     
     public func getDetails() {
@@ -172,89 +259,6 @@ internal class UsageReader: Reader<Network_Usage> {
         let data: UnsafeMutablePointer<if_data>? = unsafeBitCast(pointer.pointee.ifa_data, to: UnsafeMutablePointer<if_data>.self)
         return (upload: Int64(data?.pointee.ifi_obytes ?? 0), download: Int64(data?.pointee.ifi_ibytes ?? 0))
     }
-    
-    private func interfaceBandwidthUsage() -> BandwidthUsage {
-        var interfaceAddresses: UnsafeMutablePointer<ifaddrs>? = nil
-        var totalUpload: Int64 = 0
-        var totalDownload: Int64 = 0
-        guard getifaddrs(&interfaceAddresses) == 0 else {
-            return (0, 0)
-        }
-        
-        var pointer = interfaceAddresses
-        while pointer != nil {
-            defer { pointer = pointer?.pointee.ifa_next }
-            
-            if String(cString: pointer!.pointee.ifa_name) != self.interfaceID {
-                continue
-            }
-            
-            if let ip = getLocalIP(pointer!), self.usage.laddr != ip {
-                self.usage.laddr = ip
-            }
-            
-            if let info = getBytesInfo(pointer!) {
-                totalUpload += info.upload
-                totalDownload += info.download
-            }
-        }
-        freeifaddrs(interfaceAddresses)
-        
-        return (totalUpload, totalDownload)
-    }
-    
-    private func allProcessesBandwidthUsage() -> BandwidthUsage {
-        let task = Process()
-        task.launchPath = "/usr/bin/nettop"
-        task.arguments = ["-P", "-L", "1", "-k", "time,interface,state,rx_dupe,rx_ooo,re-tx,rtt_avg,rcvsize,tx_win,tc_class,tc_mgt,cc_algo,P,C,R,W,arch"]
-        
-        let outputPipe = Pipe()
-        let errorPipe = Pipe()
-        
-        task.standardOutput = outputPipe
-        task.standardError = errorPipe
-        
-        do {
-            try task.run()
-        } catch let error {
-            print(error)
-            return (0, 0)
-        }
-        
-        let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
-        let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
-        let output = String(decoding: outputData, as: UTF8.self)
-        _ = String(decoding: errorData, as: UTF8.self)
-        
-        if output.isEmpty {
-            return (0, 0)
-        }
-
-        var totalUpload: Int64 = 0
-        var totalDownload: Int64 = 0
-        var firstLine = false
-        output.enumerateLines { (line, _) -> () in
-            if !firstLine {
-                firstLine = true
-                return
-            }
-            
-            let parsedLine = line.split(separator: ",")
-            guard parsedLine.count >= 3 else {
-                return
-            }
-            
-            if let download = Int(parsedLine[1]) {
-                totalDownload += Int64(download)
-            }
-            if let upload = Int(parsedLine[2]) {
-                totalUpload += Int64(upload)
-            }
-        }
-        
-        return (totalUpload, totalDownload)
-    }
-    
 }
 
 public class ProcessReader: Reader<[Network_Process]> {
diff --git a/Modules/Net/settings.swift b/Modules/Net/settings.swift
index e1423d32..2e325290 100644
--- a/Modules/Net/settings.swift
+++ b/Modules/Net/settings.swift
@@ -16,6 +16,7 @@ import SystemConfiguration
 
 internal class Settings: NSView, Settings_v {
     private var numberOfProcesses: Int = 8
+    private var readerType: String = "interface"
     
     public var callback: (() -> Void) = {}
     public var callbackWhenUpdateNumberOfProcesses: (() -> Void) = {}
@@ -30,6 +31,7 @@ internal class Settings: NSView, Settings_v {
         self.title = title
         self.store = store
         self.numberOfProcesses = store.pointee.int(key: "\(self.title)_processes", defaultValue: self.numberOfProcesses)
+        self.readerType = store.pointee.string(key: "\(self.title)_reader", defaultValue: self.readerType)
         
         super.init(frame: CGRect(
             x: 0,
@@ -56,22 +58,30 @@ internal class Settings: NSView, Settings_v {
         self.subviews.forEach{ $0.removeFromSuperview() }
         
         let rowHeight: CGFloat = 30
-        let num: CGFloat = 1
-        
-        self.addNetworkSelector()
+        let num: CGFloat = 2
         
         self.addSubview(SelectTitleRow(
-            frame: NSRect(x: Constants.Settings.margin, y: rowHeight + (Constants.Settings.margin*2), width: self.frame.width - (Constants.Settings.margin*2), height: 30),
+            frame: NSRect(x: Constants.Settings.margin, y: Constants.Settings.margin + (rowHeight + Constants.Settings.margin) * 2, width: self.frame.width - (Constants.Settings.margin*2), height: 30),
             title: LocalizedString("Number of top processes"),
             action: #selector(changeNumberOfProcesses),
             items: NumbersOfProcesses.map{ "\($0)" },
             selected: "\(self.numberOfProcesses)"
         ))
         
+        self.addSubview(SelectRow(
+            frame: NSRect(x: Constants.Settings.margin, y: Constants.Settings.margin + (rowHeight + Constants.Settings.margin) * 1, width: self.frame.width - (Constants.Settings.margin*2), height: 30),
+            title: LocalizedString("Reader type"),
+            action: #selector(changeReaderType),
+            items: NetworkReaders,
+            selected: self.readerType
+        ))
+        
+        self.addInterfaceSelector()
+        
         self.setFrameSize(NSSize(width: self.frame.width, height: (rowHeight*(num+1)) + (Constants.Settings.margin*(2+num))))
     }
     
-    private func addNetworkSelector() {
+    private func addInterfaceSelector() {
         let view: NSView = NSView(frame: NSRect(x: Constants.Settings.margin, y: Constants.Settings.margin, width: self.frame.width, height: 30))
         
         let rowTitle: NSTextField = LabelField(frame: NSRect(x: 0, y: (view.frame.height - 16)/2, width: view.frame.width - 52, height: 17), LocalizedString("Network interface"))
@@ -79,8 +89,9 @@ internal class Settings: NSView, Settings_v {
         rowTitle.textColor = .textColor
         
         self.button = NSPopUpButton(frame: NSRect(x: view.frame.width - 200 - Constants.Settings.margin*2, y: 0, width: 200, height: 30))
-        self.button!.target = self
+        self.button?.target = self
         self.button?.action = #selector(self.handleSelection)
+        self.button?.isEnabled = self.readerType == "interface"
         
         let selectedInterface = self.store.pointee.string(key: "\(self.title)_interface", defaultValue: "")
         let menu = NSMenu()
@@ -130,4 +141,13 @@ internal class Settings: NSView, Settings_v {
             self.callbackWhenUpdateNumberOfProcesses()
         }
     }
+    
+    @objc private func changeReaderType(_ sender: NSMenuItem) {
+        guard let key = sender.representedObject as? String else {
+            return
+        }
+        self.readerType = key
+        self.store.pointee.set(key: "\(self.title)_reader", value: key)
+        self.button?.isEnabled = self.readerType == "interface"
+    }
 }
diff --git a/Stats/Supporting Files/de.lproj/Localizable.strings b/Stats/Supporting Files/de.lproj/Localizable.strings
index 0f69d145..7e2998ca 100644
--- a/Stats/Supporting Files/de.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/de.lproj/Localizable.strings	
@@ -135,6 +135,9 @@
 "Network interface" = "Netzwerkschnittstelle";
 "Total download" = "Empfangen";
 "Total upload" = "Gesendet";
+"Reader type" = "Lesertyp";
+"Interface" = "Schnittstelle";
+"Process" = "Prozess";
 
 // Battery
 "Level" = "Ladezustand";
diff --git a/Stats/Supporting Files/en.lproj/Localizable.strings b/Stats/Supporting Files/en.lproj/Localizable.strings
index ea13a090..a634c9de 100644
--- a/Stats/Supporting Files/en.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/en.lproj/Localizable.strings	
@@ -136,6 +136,9 @@
 "Network interface" = "Network interface";
 "Total download" = "Total download";
 "Total upload" = "Total upload";
+"Reader type" = "Reader type";
+"Interface" = "Interface";
+"Process" = "Process";
 
 // Battery
 "Level" = "Level";
diff --git a/Stats/Supporting Files/es.lproj/Localizable.strings b/Stats/Supporting Files/es.lproj/Localizable.strings
index e6e01690..08b79e3d 100644
--- a/Stats/Supporting Files/es.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/es.lproj/Localizable.strings	
@@ -132,6 +132,9 @@
 "Network interface" = "Interfaz de red";
 "Total download" = "Descarga total";
 "Total upload" = "Carga total";
+"Reader type" = "Tipo de lector";
+"Interface" = "Interfaz";
+"Process" = "Proceso";
 
 // Battery
 "Level" = "Nivel";
diff --git a/Stats/Supporting Files/fr.lproj/Localizable.strings b/Stats/Supporting Files/fr.lproj/Localizable.strings
index fb88bc2b..10cbc734 100644
--- a/Stats/Supporting Files/fr.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/fr.lproj/Localizable.strings	
@@ -135,6 +135,9 @@
 "Network interface" = "Interface réseau";
 "Total download" = "Total download";
 "Total upload" = "Total upload";
+"Reader type" = "Type de lecteur";
+"Interface" = "Interface";
+"Process" = "Processus";
 
 // Battery
 "Level" = "Niveau";
diff --git a/Stats/Supporting Files/it.lproj/Localizable.strings b/Stats/Supporting Files/it.lproj/Localizable.strings
index 4d51b9f5..0942c2fb 100644
--- a/Stats/Supporting Files/it.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/it.lproj/Localizable.strings	
@@ -136,6 +136,9 @@
 "Network interface" = "Interfaccia di rete";
 "Total download" = "Download totale";
 "Total upload" = "Upload totale";
+"Reader type" = "Tipo di lettore";
+"Interface" = "Interfaccia";
+"Process" = "Processi";
 
 // Battery
 "Level" = "Livello";
diff --git a/Stats/Supporting Files/ko.lproj/Localizable.strings b/Stats/Supporting Files/ko.lproj/Localizable.strings
index 89c83683..8bc5e842 100644
--- a/Stats/Supporting Files/ko.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/ko.lproj/Localizable.strings	
@@ -135,6 +135,9 @@
 "Network interface" = "네트워크 인터페이스";
 "Total download" = "총 다운로드";
 "Total upload" = "총 업로드";
+"Reader type" = "리더 유형";
+"Interface" = "상호 작용";
+"Process" = "프로세스";
 
 // Battery
 "Level" = "잔량";
diff --git a/Stats/Supporting Files/nb.lproj/Localizable.strings b/Stats/Supporting Files/nb.lproj/Localizable.strings
index 09e74a3e..9e8d10de 100644
--- a/Stats/Supporting Files/nb.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/nb.lproj/Localizable.strings	
@@ -136,6 +136,9 @@
 "Network interface" = "Nettverksgrensesnitt";
 "Total download" = "Totalt lastet ned";
 "Total upload" = "Totalt lastet opp";
+"Reader type" = "Lesertype";
+"Interface" = "Grensesnitt";
+"Process" = "Prosess";
 
 // Battery
 "Level" = "Nivå";
diff --git a/Stats/Supporting Files/pl.lproj/Localizable.strings b/Stats/Supporting Files/pl.lproj/Localizable.strings
index 6966d760..da734d45 100644
--- a/Stats/Supporting Files/pl.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/pl.lproj/Localizable.strings	
@@ -136,6 +136,9 @@
 "Network interface" = "Interfejs sieciowy";
 "Total download" = "Całkowicie pobrano";
 "Total upload" = "Całkowicie przesłano";
+"Reader type" = "Sposób odczytu";
+"Interface" = "Interfejs";
+"Process" = "Procesy";
 
 // Battery
 "Level" = "Poziom naładowania";
diff --git a/Stats/Supporting Files/pt-BR.lproj/Localizable.strings b/Stats/Supporting Files/pt-BR.lproj/Localizable.strings
index 2ebd2dc6..bbbbcde7 100644
--- a/Stats/Supporting Files/pt-BR.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/pt-BR.lproj/Localizable.strings	
@@ -136,6 +136,9 @@
 "Network interface" = "Interface de rede";
 "Total download" = "Download total";
 "Total upload" = "Upload total";
+"Reader type" = "Tipo de leitor";
+"Interface" = "Interface";
+"Process" = "Processo";
 
 // Battery
 "Level" = "Nível";
diff --git a/Stats/Supporting Files/ru.lproj/Localizable.strings b/Stats/Supporting Files/ru.lproj/Localizable.strings
index 88d2731d..371f4ff0 100644
--- a/Stats/Supporting Files/ru.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/ru.lproj/Localizable.strings	
@@ -136,6 +136,9 @@
 "Network interface" = "Сетевой интерфейс";
 "Total download" = "Всего скачано";
 "Total upload" = "Всего выгружено";
+"Reader type" = "Метод чтения";
+"Interface" = "Интерфейс";
+"Process" = "Процессы";
 
 // Battery
 "Level" = "Уровень заряда";
diff --git a/Stats/Supporting Files/tr.lproj/Localizable.strings b/Stats/Supporting Files/tr.lproj/Localizable.strings
index 823b62fe..0bc0a404 100644
--- a/Stats/Supporting Files/tr.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/tr.lproj/Localizable.strings	
@@ -135,6 +135,9 @@
 "Network interface" = "Ağ arayüzü";
 "Total download" = "Tamamen indirildi";
 "Total upload" = "Tamamen yüklendi";
+"Reader type" = "Okuma yöntemi";
+"Interface" = "Arayüz";
+"Process" = "Süreçler";
 
 // Battery
 "Level" = "Doluluk";
diff --git a/Stats/Supporting Files/uk.lproj/Localizable.strings b/Stats/Supporting Files/uk.lproj/Localizable.strings
index 400fac27..43ceceef 100644
--- a/Stats/Supporting Files/uk.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/uk.lproj/Localizable.strings	
@@ -136,6 +136,9 @@
 "Network interface" = "Мережевий інтерфейс";
 "Total download" = "Загально завантажено";
 "Total upload" = "Загально вислано";
+"Reader type" = "Метод читання";
+"Interface" = "Інтерфейс";
+"Process" = "Процеси";
 
 // Battery
 "Level" = "Рівень заряду";
diff --git a/Stats/Supporting Files/vi.lproj/Localizable.strings b/Stats/Supporting Files/vi.lproj/Localizable.strings
index 75d79bf1..eb6986ce 100644
--- a/Stats/Supporting Files/vi.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/vi.lproj/Localizable.strings	
@@ -136,6 +136,9 @@
 "Network interface" = "Giao diện mạng";
 "Total download" = "Tổng tải";
 "Total upload" = "Tổng upload";
+"Reader type" = "Loại trình đọc";
+"Interface" = "Giao diện";
+"Process" = "Quá trình";
 
 // Battery
 "Level" = "Dung lượng Pin";
diff --git a/Stats/Supporting Files/zh-Hans.lproj/Localizable.strings b/Stats/Supporting Files/zh-Hans.lproj/Localizable.strings
index 2457c8a6..73ea0a62 100644
--- a/Stats/Supporting Files/zh-Hans.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/zh-Hans.lproj/Localizable.strings	
@@ -135,6 +135,9 @@
 "Network interface" = "网络接口";
 "Total download" = "共下载";
 "Total upload" = "总上传";
+"Reader type" = "读卡器类型";
+"Interface" = "接口";
+"Process" = "处理";
 
 // Battery
 "Level" = "电量";
diff --git a/Stats/Supporting Files/zh-Hant.lproj/Localizable.strings b/Stats/Supporting Files/zh-Hant.lproj/Localizable.strings
index 3cfaef9a..cbcda83a 100644
--- a/Stats/Supporting Files/zh-Hant.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/zh-Hant.lproj/Localizable.strings	
@@ -131,6 +131,9 @@
 "Network interface" = "網路介面";
 "Total download" = "共下載";
 "Total upload" = "共上傳";
+"Reader type" = "讀卡器類型";
+"Interface" = "接口";
+"Process" = "處理";
 
 // Battery
 "Level" = "電量";
diff --git a/StatsKit/helpers.swift b/StatsKit/helpers.swift
index 0913f9b3..470b0330 100644
--- a/StatsKit/helpers.swift
+++ b/StatsKit/helpers.swift
@@ -83,6 +83,12 @@ public let ShortLong: [KeyValue_t] = [
 public let ReaderUpdateIntervals: [Int] = [1, 2, 3, 5, 10, 15, 30]
 public let NumbersOfProcesses: [Int] = [3, 5, 8, 10, 15]
 
+public typealias Bandwidth = (upload: Int64, download: Int64)
+public let NetworkReaders: [KeyValue_t] = [
+    KeyValue_t(key: "interface", value: "Interface based"),
+    KeyValue_t(key: "process", value: "Processes based"),
+]
+
 public struct Units {
     public let bytes: Int64