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, and then flash the screen 2. The mobile phone enters the mobile phone settings for Bluetooth, connects to BT28, and the voice prompts that the connection is successful 3. FM shunting radio frequency is the same as MP3 Bluetooth 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 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 / 2.1A FM frequency: 87.5-108MHz The package includes: 1Bluetooth FM transmitter Thank you for your support!Welcome to buy from us!if you want buy more than we listed, please