feature: Automatically switch from music playing state to hands-free mode when answering a call Built-in microphone Robust design with LED frequency display Support last call redial Instructions for use 1. Insert the cigarette plug into the cigarette socket of the car insert the mp3 Bluetooth-compatible and then flash the screen 2. The mobile phone enters the mobile phone settings for Bluetooth-compatible connects to BT28 and the voice prompts that the connection is successful 3. FM shunting radio frequency is the same as MP3 Bluetooth-compatible 4. Mobile phone music player can play music through the car speaker keyboard 1. Short pause\/play button 2. When there is an incoming call short press to answer the call (long press to answer the call); when calling or marking a scene short press to raise your hand; short press twice to remember your last call. 3Frequency and purpose: long press for 3-5 seconds when refreshing the screen at this time press a track\/previous paragraph to change the transmission frequency 4. Volume adjustment: Press and hold for 3-5 seconds when the screen flashes at this time long press a track\/to change the volume specification: Type: ABS project Type: Bluetooth-compatible Features: FM transmitter Product size: 3.5 * 3.5 * 8 cm \/ 1.4 * 3'' (length * width * height) Product model: BT28 Supported files: MP3 \/ WMA \/ WAV \/ APE \/ FLAC Supported U Disk Capacity: Class 10 up to 32G USB output: Maximum 5V \/ 3.6A FM frequency: 87.5-108MHz The package includes: 1Bluetooth-compatible FM transmitter guys thank you for visiting my store.You can contact with us to get more detail of the goods .we will be ready to reply you ASAP.