Bolayu i6 BT USB Charger LCD Car Kit Bluetooth MP3 FM Transmitter With Hands-Free Suitable for Android/iPhone/Other Smart Phone. Built-in FM transmitter, full frequency: 88.1-107.9 MHZ. Excellent sound quality with D.S.P solution for echo cancellation. LED display. With built-in microphone. Supports USB disk, TF card. Wirelessly transmit phone call from Bluetooth mobile phone to the car FM stereo system.