diff --git a/app/src/main/java/ru/ua1zbe/svxremote/MainActivity.kt b/app/src/main/java/ru/ua1zbe/svxremote/MainActivity.kt
index 4c415f1..05795f4 100644
--- a/app/src/main/java/ru/ua1zbe/svxremote/MainActivity.kt
+++ b/app/src/main/java/ru/ua1zbe/svxremote/MainActivity.kt
@@ -9,6 +9,8 @@ import android.content.Intent
 import android.content.ServiceConnection
 import android.content.pm.PackageManager
 import android.net.Uri
+import android.content.res.ColorStateList
+import android.graphics.Color
 import android.graphics.PixelFormat
 import android.os.Build
 import android.os.Bundle
@@ -57,10 +59,12 @@ class MainActivity : Activity(), SvxService.Listener {
     private lateinit var micDb: TextView
     private lateinit var pttButton: PttButton
     private lateinit var btnSettings: ImageButton
+    private lateinit var btnMonitor: ImageButton
 
     private val mainHandler = Handler(Looper.getMainLooper())
 
     private var connected = false
+    private var monitoring = false
     private var settings: ConnectionSettings = ConnectionSettings("", 5300, "", "", 11)
 
     private var svc: SvxService? = null
@@ -101,8 +105,11 @@ class MainActivity : Activity(), SvxService.Listener {
         micDb = findViewById(R.id.mic_db)
         pttButton = findViewById(R.id.ptt_button)
         btnSettings = findViewById(R.id.btn_settings)
+        btnMonitor = findViewById(R.id.btn_monitor)
         pttButton.enabled2 = false
 
+        btnMonitor.setOnClickListener { toggleMonitoring() }
+        updateMonitorButton()
         val testText = intent?.getStringExtra("node_toast_test")
         if (testText != null) {
             mainHandler.postDelayed({ showNodeOverlay(testText) }, 1500)
@@ -239,7 +246,11 @@ class MainActivity : Activity(), SvxService.Listener {
                 ReflectorClient.STATE_READY -> {
                     connected = true
                     updatePttEnabled()
-                    statusChip.text = getString(R.string.status_connected)
+                    statusChip.text = if (monitoring) {
+                        getString(R.string.status_monitoring, monitorTgLabel())
+                    } else {
+                        getString(R.string.status_connected)
+                    }
                     statusChip.setTextColor(getColor(R.color.accent))
                     lblTxState.text = getString(R.string.status_big_connected)
                     lblTxState.setTextColor(getColor(R.color.accent))
@@ -280,7 +291,11 @@ class MainActivity : Activity(), SvxService.Listener {
 
     override fun onTalkerStart(tg: Long, callsign: String) {
         mainHandler.post {
-            lblTalkerTitle.text = getString(R.string.talker_now, callsign)
+            lblTalkerTitle.text = if (monitoring) {
+                getString(R.string.talker_mon, callsign, tg)
+            } else {
+                getString(R.string.talker_now, callsign)
+            }
             lblTalker.text = callsign
         }
     }
@@ -366,7 +381,7 @@ class MainActivity : Activity(), SvxService.Listener {
     }
 
     private fun updatePttEnabled() {
-        pttButton.enabled2 = connected
+        pttButton.enabled2 = connected && !monitoring
     }
 
     private fun requestPermissionsIfNeeded() {
@@ -391,12 +406,36 @@ class MainActivity : Activity(), SvxService.Listener {
                     port = settings.port,
                     callsign = settings.callsign,
                     authKey = settings.authKey,
-                    talkGroup = settings.talkGroup
+                    talkGroup = settings.talkGroup,
+                    monitorTgs = if (monitoring) settings.groups else null
                 )
             )
         }, 300)
     }
 
+    /** Включить/выключить режим мониторинга групп с переподключением. */
+    private fun toggleMonitoring() {
+        monitoring = !monitoring
+        updateMonitorButton()
+        updatePttEnabled()
+        if (connected) {
+            svc?.disconnect()
+            mainHandler.postDelayed({ connect() }, 500)
+        } else {
+            connect()
+        }
+    }
+
+    private fun updateMonitorButton() {
+        val active = monitoring
+        btnMonitor.imageTintList = ColorStateList.valueOf(
+            if (active) Color.parseColor("#58A6FF") else Color.parseColor("#8B949E")
+        )
+        btnMonitor.setBackgroundResource(if (active) R.drawable.bg_monitor_on else 0)
+        btnMonitor.contentDescription =
+            getString(if (active) R.string.btn_monitor_on else R.string.btn_monitor)
+    }
+
     /** Переключиться на другую группу: пересохранить и переподключиться. */
     private fun switchGroup(tg: Long) {
         settings = settings.copy(talkGroup = tg)
@@ -406,6 +445,9 @@ class MainActivity : Activity(), SvxService.Listener {
         mainHandler.postDelayed({ connect() }, 500)
     }
 
+    private fun monitorTgLabel(): String =
+        settings.groups.joinToString(", ") { "TG$it" }
+
     private fun showNodesDialog() {
         val nodes = svc?.nodeList().orEmpty()
         if (nodes.isEmpty()) {
diff --git a/app/src/main/java/ru/ua1zbe/svxremote/proto/ReflectorClient.kt b/app/src/main/java/ru/ua1zbe/svxremote/proto/ReflectorClient.kt
index 65f339b..f74c9cd 100644
--- a/app/src/main/java/ru/ua1zbe/svxremote/proto/ReflectorClient.kt
+++ b/app/src/main/java/ru/ua1zbe/svxremote/proto/ReflectorClient.kt
@@ -58,7 +58,9 @@ class ReflectorClient(
         val port: Int,
         val callsign: String,
         val authKey: String,
-        val talkGroup: Long
+        val talkGroup: Long,
+        /** Список групп для мониторинга; null = обычный режим (своя группа). */
+        val monitorTgs: List<Long>? = null
     )
 
     @Volatile
@@ -361,8 +363,14 @@ class ReflectorClient(
                     // (иначе сервер не шлёт аудио группы и не показывает
                     // подписку в статусе: monitoredTGs остаётся пустым).
                     sendTcp(socket, MsgBuilder.nodeInfo(CLIENT_SW_INFO, CLIENT_SW_VERSION))
-                    sendTcp(socket, MsgBuilder.selectTg(s.talkGroup))
-                    sendTcp(socket, MsgBuilder.tgMonitor(listOf(s.talkGroup)))
+                    val monitor = s.monitorTgs
+                    if (monitor.isNullOrEmpty()) {
+                        sendTcp(socket, MsgBuilder.selectTg(s.talkGroup))
+                        sendTcp(socket, MsgBuilder.tgMonitor(listOf(s.talkGroup)))
+                    } else {
+                        sendTcp(socket, MsgBuilder.selectTg(0))
+                        sendTcp(socket, MsgBuilder.tgMonitor(monitor))
+                    }
                     openUdp(s)
                 }
 
diff --git a/app/src/main/res/drawable/bg_monitor_on.xml b/app/src/main/res/drawable/bg_monitor_on.xml
new file mode 100644
index 0000000..e4b5c1b
--- /dev/null
+++ b/app/src/main/res/drawable/bg_monitor_on.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+    <solid android:color="#3358A6FF" />
+</shape>
\ No newline at end of file
diff --git a/app/src/main/res/drawable/ic_headset.xml b/app/src/main/res/drawable/ic_headset.xml
new file mode 100644
index 0000000..8eca7e0
--- /dev/null
+++ b/app/src/main/res/drawable/ic_headset.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#8B949E"
+        android:pathData="M12,1c-4.97,0 -9,4.03 -9,9v7c0,1.66 1.34,3 3,3h3v-8L5,12v-2c0,-3.87 3.13,-7 7,-7s7,3.13 7,7v2h-4v8h3c1.66,0 3,-1.34 3,-3v-7c0,-4.97 -4.03,-9 -9,-9z" />
+</vector>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3a8630d..6596292 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -84,6 +84,15 @@
                     android:ellipsize="end"
                     android:text="@string/settings_not_configured" />
 
+                <ImageButton
+                    android:id="@+id/btn_monitor"
+                    android:layout_width="44dp"
+                    android:layout_height="44dp"
+                    android:src="@drawable/ic_headset"
+                    android:background="?android:attr/selectableItemBackgroundBorderless"
+                    android:contentDescription="@string/btn_monitor"
+                    android:scaleType="centerInside" />
+
                 <TextView
                     android:id="@+id/lbl_tg"
                     android:layout_width="wrap_content"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d559787..0dececf 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -27,6 +27,10 @@
     <string name="status_disconnected">Отключено</string>
     <string name="app_title">SVXHomyak</string>
     <string name="btn_power">Выключить: отключиться и закрыть</string>
+    <string name="btn_monitor">Мониторинг групп (нажмите, чтобы включить)</string>
+    <string name="btn_monitor_on">Мониторинг групп включен (нажмите, чтобы выключить)</string>
+    <string name="status_monitoring">Мониторинг: %1$s</string>
+    <string name="talker_mon">Говорит: %1$s · TG%2$d</string>
     <string name="status_big_disconnected">DISCONNECTED</string>
     <string name="status_big_connected">CONNECTED</string>
     <string name="status_big_talking">ПЕРЕДАЧА</string>