Features:1. Wireless with MIC2. Support SD card and USB disc3. Bluetooth FM modulator4. Apply to USB devices and MP3 player5. Convert to hand free automatically when there is a call6. Transmit the audio wireless to the radio7. Give a variety of smart phone charging8. Portable， Swivel axis design， easy to use Parameters:Frequency Response: 20Hz-15KhzTransmission Frequency: 87.5-108MHzSupported Format: MP3， WMARated Operating Voltage:12 VUltimate Operating Voltage: 9-26 VSNR Ratio > 60dBMIC Range: 0-2mAudio Distortion Degree: 0.1%Power Consumption: 1WWork Temperature: -20-50 DegreeBluetooth Version: 3.0Bluetooth Transmission Distance: 10-15mDimensions: 11 x 4 x 3 cm/4.33'' x 1.57'' x 1.18''(Approx.)Color: Black Package Includes:1 x Hands Free Car Kit FM Transmitter1 x Remote Controller1 x Button Battery for Remote Controller