Product information：Material type: ABSProduct type: FM transmitterSupport car voltage display: low voltage reminderHands-free call support: Bluetooth compatible hands-freeBuilt-in microphone: hands-free call car kitBluetooth compatible FM transmitter: transmitter FM Bluetooth compatible function:1. Accurate construction.2. USB 3.1 A charger, Bluetooth compatible with version 5.0.3. Listening charges.4. Support power and storage functions.5. The frequency can be displayed on the screen.6. Support Bluetooth compatible/USB player and Bluetooth compatible hands-free communication7. This product adopts FM full-frequency wireless transmission technology, which can directly read the audio files of mobile phone Bluetooth compatible/U disk. Support Bluetooth compatible audio playback and Bluetooth compatible hands-free calling. Support smart APP function, lossless high-quality audio decoding; multi-function MP3 USB automatic charging function.8. Noise reduction function, built-in noise reduction circuit to make the sound clearer. Packing listCharger x1