Hands-free calling: With a microphone design, you can make hands- free callings easily and safely. Intelligently compatible: Compatible with all digital devices with Bluetooth capabilities 2 USB Charging Ports: With two USB charging ports, you can charge more devices simultaneously. No need to worry about power shortage. LED screen, can display frequency, song serial number and working status information Support folder playback function Support lossless music playback, support power-off memory function Intelligently compatible: Compatible with all digital devices with Bluetooth capabilities Specifications: Model; BT-06 Size: 13*10*3.5CM Colour: BLACK Voltage limit; 10V-26v Play format: MP3/WMA FM frequency: 87.5-198.0Mhz Bluetooth version: 4,2+EDR USB output: 5V/2.1A+1A Bluetooth output distance: <5M Rated working voltage: 12V-24V Package Included: 1 *Wireless In-Car Bluetooth FM Transmitter. 1 * User manual.