Stream your Android phone's microphone live to a connected Bluetooth speaker, headset, or earbuds.
Useful for turning a phone into a wireless mic into a BT speaker — small public speaking, field recording monitor, hearing assistance, etc.
- A2DP mode (default): routes mic audio as media to any paired Bluetooth speaker. ~150–250 ms latency, full audio bandwidth.
- SCO low-latency mode: routes via the Bluetooth HFP profile to headsets/earbuds. ~40–80 ms latency, narrowband speech quality. Pure speakers without a mic profile won't appear.
- Toggle / Hold-to-speak: tap the big red button to keep streaming, or hold it for push-to-talk.
- Auto-detects when a Bluetooth device connects/disconnects while the app is open.
- Android 12 (API 31) or newer.
| Permission | Why |
|---|---|
RECORD_AUDIO |
Capture from the microphone. |
MODIFY_AUDIO_SETTINGS |
Switch audio routing modes. |
BLUETOOTH_CONNECT |
Required only when low-latency (SCO) mode is enabled, to route to a Bluetooth communication device. |
The app does not access the network, contacts, location, or any other data.
Requires JDK 17 and the Android SDK with platforms;android-34 and build-tools;34.0.0+.
./gradlew assembleDebug
# or, for a signed release:
./gradlew assembleRelease \
-PreleaseStoreFile=/path/to/release.jks \
-PreleaseStorePassword=… -PreleaseKeyAlias=… -PreleaseKeyPassword=…The debug APK lands at app/build/outputs/apk/debug/app-debug.apk.