Bluetooth In-Car Wireless Adapter FM Transmitter MP3 Radio Car Kit 2 USB Charger Bluetooth In-Car Wireless Adapter FM Transmitter MP3 Radio Car Kit 2 USB Charger Product Features: ? New Wireless Vehicle Bluetooth FM Transmitter Car Charger ? 100% Brand new and high quality ? Multifunctional: Wireless connection(Bluetooth), Build in microphone, FM transmitter+USB Charger+MP3 Player ? Supports Bluetooth hand-free phone call , build-in microphone. ? Noise cancelling technology that allow for clear and crisp phone calls and music. ? With FM transmitter function, supports adjustment. Full-frequency covered 87.5-108.0MHz. ? Allowed to accept MicroSD card up to 32G and play playing music on MP3/WMA form. ? Come with 2 USB charging ports (5V/3.1A and 1.0A) for charging your smart phone or tablet. ? The main button on the middle supports to change music or swap call, the near rotary knob is designed to adjust the volume. ? Item comes with 30 days money back guarantee. Product Details: ? Bluetooth version: V5.1 ? Bluetooth protocol: A2DP, AVRCP, HFP ? Bluetooth band: 2.4 GHz-2.48 GHz ? Bluetooth Transmission distance: 5m ? FM frequency: 87.5-108 mhz ? FM transfer distance: 2meters ? Input voltage: 12-24V ? Output: 5V/2.1A ? Music format: mp3, wma (description exceeds maximum possible length)