iMars™ iM-M2 4.2A 21W Wireless In-Car FM Transmitter Bluetooth Player Car Kit Dual USB Charger Handsfree MP3Description:Multi-function: FM transmitter function、 bluetooth function、 USB charger function、 handsfree、 etc.Two-port USB car charger charges your favorite mobile devices at the same time.Can greatly enjoy music and pick the call up during driving.Built-in FM transmitter、 full frequency: 87.5-108.0 MHz Excellent voice quality、 use the DSP (digital signal process) technology to echo cancellation Switch to hands-free mode automatically from music playing status when receives an incoming call.Double USB charging ports for charging iPod\/iPhone、 Samsung、 iPad、 Nokia and other mobile devices.Specification:          Rated operating voltag       12V           Working voltage limits       9~26V           USB Output       5V\/4.2A           Working Temp       0~50\u2103           SNR       >60dB           Distortion       <0.1%           Frequency Response       20Hz-15Khz           Left and right channel separation       >60dB           BT Version       Version 2.1           Bluetooth Sound Processing       A2DP(Advance Audio Distribution Profile)             BT transmission Distance       10M at max           Mic Effective Distance       0.5~2M           FM Frequency       87.5~108Mhz           FM Transmitter       Stereo digital PLL frequency-locked   Package included:1 X iMars™ iM-M2 Car FM Transmitter1 X AUX Audio Cable1 X User Manual