Wireless Handsfree Car FM Transmitter Kit MP3 Music Player Radio Audio Adapter Description: This product is a car-specific hands-free car charger MP3 player. It can transmit MP3 music from your mobile phone to your car audio through wireless transmission, also it can make hands-free calling. You can enjoy the music and answer the call in hand-free mode without refitting your car, which ensures driving safety while listening to music.   Specification: Frequency response: 20Hz -20 kHz Operating distance: up to 10m LCD displays frequency with backlight Transmission range: 87.0 - 108.5MHz (interval 0.1MHz) Power source: rechargeable built-in lithium battery Size: 57 x 20 x 10mm Package Contents: 1 x Wireless FM Transmitter