diff --git a/cmvr-es/devices/microphone/abstract_microphone.h b/cmvr-es/devices/microphone/abstract_microphone.h
index b4770343..f7f7798c 100644
--- a/cmvr-es/devices/microphone/abstract_microphone.h
+++ b/cmvr-es/devices/microphone/abstract_microphone.h
@@ -34,7 +34,11 @@ namespace cmvr::device{
             }
             return health;
         }
-        virtual void startRecording(const std::string& outputFilePath) {}
+        virtual bool selectInputDevice(const std::string& input_device) {
+            (void)input_device;
+            return false;
+        }
+        virtual bool startRecording(const std::string& outputFilePath) { return false; }
         virtual void stopRecording() {}
         virtual void pause() {}
         virtual void resume() {}
diff --git a/cmvr-es/devices/microphone/ffmpeg_microphone/include/ffmpeg_microphone.h b/cmvr-es/devices/microphone/ffmpeg_microphone/include/ffmpeg_microphone.h
index cd41d881..c9c2fb31 100644
--- a/cmvr-es/devices/microphone/ffmpeg_microphone/include/ffmpeg_microphone.h
+++ b/cmvr-es/devices/microphone/ffmpeg_microphone/include/ffmpeg_microphone.h
@@ -33,7 +33,8 @@ namespace cmvr::device {
         bool start() override;
         bool stop() override;
         void getState(MicrophoneState &state) override;
-        void startRecording(const std::string& outputFilePath) override;
+        bool selectInputDevice(const std::string& input_device) override;
+        bool startRecording(const std::string& outputFilePath) override;
         void stopRecording() override;
         void pause() override;
         void resume() override;
diff --git a/cmvr-es/devices/microphone/ffmpeg_microphone/src/ffmpeg_microphone.cpp b/cmvr-es/devices/microphone/ffmpeg_microphone/src/ffmpeg_microphone.cpp
index 9e254c52..197fc365 100644
--- a/cmvr-es/devices/microphone/ffmpeg_microphone/src/ffmpeg_microphone.cpp
+++ b/cmvr-es/devices/microphone/ffmpeg_microphone/src/ffmpeg_microphone.cpp
@@ -149,20 +149,46 @@ void ffmpegMicroPhone::getState(MicrophoneState& state)
     state = state_;
 }
 
-void ffmpegMicroPhone::startRecording(const std::string& outputFilePath)
+bool ffmpegMicroPhone::selectInputDevice(const std::string& input_device)
+{
+    if (input_device.empty()) {
+        return false;
+    }
+
+    std::lock_guard capture_lock(capture_mutex_);
+    lock_guard lock(mtx_);
+    if (input_device == input_device_) {
+        return true;
+    }
+    if (is_capturing_.load(std::memory_order_acquire) ||
+        state_.is_recording || stream_count_ > 0) {
+        state_.is_error = true;
+        state_.error_message = "cannot switch microphone input while capture is active";
+        return false;
+    }
+
+    input_device_ = input_device;
+    config_.set_input_device(input_device);
+    state_.is_error = false;
+    state_.error_message.clear();
+    CMVR_LOG(INFO) << "[ffmpegMicroPhone] Selected input device: " << input_device_;
+    return true;
+}
+
+bool ffmpegMicroPhone::startRecording(const std::string& outputFilePath)
 {
     std::lock_guard capture_lock(capture_mutex_);
     {
         lock_guard lock(mtx_);
         if (state_.is_recording) {
             CMVR_LOG(ERROR) << "[ffmpegMicroPhone] (startRecording): microphone is already recording";
-            return;
+            return false;
         }
         if (stream_count_ > 0 || is_capturing_) {
             state_.is_error = true;
             state_.error_message = "cannot start recording while microphone streaming is active";
             CMVR_LOG(ERROR) << "[ffmpegMicroPhone] " << state_.error_message;
-            return;
+            return false;
         }
 
         size_t dot_pos = outputFilePath.find_last_of('.');
@@ -174,7 +200,7 @@ void ffmpegMicroPhone::startRecording(const std::string& outputFilePath)
         lock_guard lock(mtx_);
         state_.is_error = true;
         state_.error_message = "FFmpeg init error";
-        return;
+        return false;
     }
 
     {
@@ -183,6 +209,7 @@ void ffmpegMicroPhone::startRecording(const std::string& outputFilePath)
         state_.is_error = false;
         state_.error_message.clear();
     }
+    return true;
 }
 
 void ffmpegMicroPhone::stopRecording()
diff --git a/cmvr-es/service/grpc/src/grpc_microphone_service.cpp b/cmvr-es/service/grpc/src/grpc_microphone_service.cpp
index 5f6f00a9..d75bfd18 100644
--- a/cmvr-es/service/grpc/src/grpc_microphone_service.cpp
+++ b/cmvr-es/service/grpc/src/grpc_microphone_service.cpp
@@ -25,6 +25,29 @@ grpc::Status failResponse(ResponseT* response, const std::string& message) {
     return grpc::Status::OK;
 }
 
+std::string selectInputDevice(
+    const std::shared_ptr<AbstractMicrophone>& microphone,
+    const std::string& input_device) {
+    if (input_device.empty()) {
+        return "Microphone input_device is required";
+    }
+
+    const auto available_devices = listAvailableMicrophoneInputDevices();
+    const auto selected = std::find_if(
+        available_devices.begin(),
+        available_devices.end(),
+        [&input_device](const MicrophoneInputDeviceInfo& device) {
+            return device.input_device == input_device;
+        });
+    if (selected == available_devices.end()) {
+        return "Microphone input device is unavailable: " + input_device;
+    }
+    if (!microphone->selectInputDevice(input_device)) {
+        return "Cannot select microphone input device while capture is active: " + input_device;
+    }
+    return {};
+}
+
 }
 
 gRPCMicroPhoneServiceImpl::gRPCMicroPhoneServiceImpl(): dmgr_(DeviceManager::getInstance()) {}
@@ -96,10 +119,22 @@ grpc::Status gRPCMicroPhoneServiceImpl::StartRecord(grpc::ServerContext* context
         if (!dev) {
             return failResponse(response, "Microphone device not found: " + dev_id);
         }
+        const std::string selection_error = selectInputDevice(dev, request->input_device());
+        if (!selection_error.empty()) {
+            return failResponse(response, selection_error);
+        }
         if (!dev->start()) {
             return failResponse(response, "Failed to start microphone: " + dev_id);
         }
-        dev->startRecording(request->file_path());
+        if (!dev->startRecording(request->file_path())) {
+            MicrophoneState state;
+            dev->getState(state);
+            return failResponse(
+                response,
+                state.error_message.empty()
+                    ? "Failed to start microphone recording: " + dev_id
+                    : state.error_message);
+        }
         response->mutable_header()->set_success(true);
         setCurrentTimestamp(response->mutable_header()->mutable_timestamp());
         CMVR_LOG(DEBUG) << "[gRPCMicroPhoneServiceImpl] (StartRecord): success, id=" << dev_id
@@ -199,6 +234,16 @@ grpc::Status gRPCMicroPhoneServiceImpl::StreamAudio(grpc::ServerContext* context
             return grpc::Status::OK;
         }
 
+        const std::string selection_error = selectInputDevice(dev, request->input_device());
+        if (!selection_error.empty()) {
+            api::StreamMicAudioCommand_Feedback feedback;
+            feedback.mutable_header()->set_success(false);
+            feedback.mutable_header()->set_error_message(selection_error);
+            setCurrentTimestamp(feedback.mutable_header()->mutable_timestamp());
+            writer->Write(feedback);
+            return grpc::Status::OK;
+        }
+
         auto& media_hub = cmvr::media::globalMediaSourceHub();
         const std::string track_id = cmvr::media::microphoneTrackId(dev_id);
         if (!cmvr::media::ensureMicrophoneMediaSource(media_hub, dev)) {
diff --git a/protos/cmvr/api/microphone_command.proto b/protos/cmvr/api/microphone_command.proto
index add491d9..20d2b100 100644
--- a/protos/cmvr/api/microphone_command.proto
+++ b/protos/cmvr/api/microphone_command.proto
@@ -43,6 +43,7 @@ message StartMicRecordingCommand {
     message Request {
         CommandHeader.Request header = 1;
         string file_path = 2;
+        string input_device = 3;
     }
     message Feedback {
         CommandHeader.Feedback header = 1;
@@ -80,6 +81,7 @@ message ResumeMicRecordingCommand {
 message StreamMicAudioCommand {
     message Request {
         CommandHeader.Request header = 1;
+        string input_device = 2;
     }
     message Feedback {
         CommandHeader.Feedback header = 1;