diff --git a/EnvSensorReader/BLEManager.swift b/EnvSensorReader/BLEManager.swift
index 5ddfa71..ec4fc38 100644
--- a/EnvSensorReader/BLEManager.swift
+++ b/EnvSensorReader/BLEManager.swift
@@ -7,6 +7,8 @@ class BLEManager: NSObject, ObservableObject {
     @Published var isScanning = false
     @Published var bluetoothState: CBManagerState = .unknown
     @Published var discoveredDevices: Set<String> = []
+    @Published var allowedUUIDs: Set<String> = []
+    @Published var discoveryMode = false
 
     private var centralManager: CBCentralManager!
     private var seenNonces: Set<String> = []
@@ -14,13 +16,6 @@ class BLEManager: NSObject, ObservableObject {
     // Configuration
     private let companyID: UInt16 = 0xFFFF
 
-    // Optional: Set specific UUIDs to filter. Empty = accept all devices with correct company ID
-    // Example: ["12345678-1234-1234-1234-123456789ABC"]
-    var allowedUUIDs: Set<String> = []
-
-    // Set to true to show all devices regardless of company ID (for discovery)
-    var discoveryMode = false
-
     override init() {
         super.init()
         centralManager = CBCentralManager(delegate: self, queue: nil)
diff --git a/EnvSensorReader/ContentView.swift b/EnvSensorReader/ContentView.swift
index f28ced3..c2187e0 100644
--- a/EnvSensorReader/ContentView.swift
+++ b/EnvSensorReader/ContentView.swift
@@ -48,6 +48,8 @@ struct ContentView: View {
                         SensorReadingRow(reading: reading)
                     }
                     .listStyle(.plain)
+                    .background(Color(.systemGroupedBackground))
+                    .scrollContentBackground(.hidden)
                 }
 
                 // Start/Stop button
@@ -63,6 +65,7 @@ struct ContentView: View {
                 .padding()
                 .disabled(bleManager.bluetoothState != .poweredOn)
             }
+            .background(Color(.systemGroupedBackground))
             .navigationTitle("EnvSensor Reader")
             .navigationBarTitleDisplayMode(.inline)
             .toolbar {
@@ -234,7 +237,21 @@ struct SensorReadingRow: View {
                     .font(.system(.body, design: .monospaced))
             }
         }
-        .padding(.vertical, 8)
+        .padding()
+        .background(
+            RoundedRectangle(cornerRadius: 12)
+                .fill(Color(.secondarySystemGroupedBackground))
+        )
+        .overlay(
+            RoundedRectangle(cornerRadius: 12)
+                .strokeBorder(Color.blue.opacity(0.4), lineWidth: 2.5)
+        )
+        .shadow(color: Color.black.opacity(0.15), radius: 5, x: 0, y: 3)
+        .padding(.vertical, 6)
+        .padding(.horizontal, 12)
+        .listRowInsets(EdgeInsets())
+        .listRowSeparator(.hidden)
+        .listRowBackground(Color.clear)
     }
 
     private func rssiColor(_ rssi: Int) -> Color {
diff --git a/README.md b/README.md
index 36e8399..4dc85bc 100644
--- a/README.md
+++ b/README.md
@@ -4,18 +4,29 @@ An iOS application for scanning and reading environmental sensor data from BLE d
 
 ## Features
 
-- Real-time BLE scanning for EnvSensor devices
-- Displays environmental readings:
+- **Real-time BLE scanning** for EnvSensor devices
+- **Environmental readings display:**
   - Temperature (°C)
   - Humidity (%)
   - Pressure (hPa)
-- Displays power metrics:
+- **Power metrics display:**
   - Voltage (V)
   - Current (mA)
   - Power (mW)
-- Shows signal strength (RSSI in dBm)
-- Automatic deduplication of readings based on nonce
-- Clean, modern SwiftUI interface
+- **Device Management:**
+  - UUID-based device filtering (iOS doesn't expose MAC addresses)
+  - Discovered devices list
+  - Optional device whitelist
+  - Discovery mode for debugging
+- **Visual Features:**
+  - Signal strength indicator (RSSI in dBm)
+  - Color-coded RSSI display
+  - Card-based UI with borders and shadows
+  - Dark/Light mode support
+- **Smart Features:**
+  - Automatic deduplication of readings based on nonce
+  - Keeps last 100 readings
+  - Company ID filtering (0xFFFF)
 
 ## Requirements
 
@@ -23,12 +34,26 @@ An iOS application for scanning and reading environmental sensor data from BLE d
 - iPhone or iPad with Bluetooth LE support
 - Xcode 15.0 or later (for building)
 
+## Device Filtering
+
+**Note:** iOS does not expose Bluetooth MAC addresses for privacy reasons. Instead, the app uses device UUIDs which are assigned by iOS.
+
+### How to Filter Devices
+
+1. **Start scanning** - The app will show all devices with Company ID `0xFFFF`
+2. **Open Settings** - Tap the gear icon in the top-right
+3. **View discovered devices** - All found devices are listed with their UUIDs
+4. **Add to filter** - Tap "Add" next to any device to whitelist it
+5. **Manual entry** - You can also manually enter UUIDs in the format `12345678-1234-1234-1234-123456789ABC`
+
+When the whitelist is empty, all devices with the correct Company ID are shown. When you add devices to the whitelist, only those specific devices will display readings.
+
 ## BLE Protocol
 
 The app scans for BLE devices with the following characteristics:
 
-- **Device Name**: `EnvSensor`
-- **Company ID**: `0xFFFF`
+- **Company ID**: `0xFFFF` (required)
+- **Device Name**: Optional, not used for filtering
 - **Data Format** (16 bytes, little-endian):
   - Bytes 0-1: Nonce (UInt16)
   - Bytes 2-3: Temperature (Int16, divide by 100 for °C)