Car MP3 FM Transmitter MJH-06M Function of Audio Transmitter They can be connected to automobile audio or family audio and played by switching the audio signal to frequency modulation, suitable for all audio output personal stereo, like CD, VCD, DVD, MP3, etc. Specification: 1.Search for all audio files and transmit with audio cable 2.Four Frequency for your choose:106.7MHz, 107.1MHz, 107.5MHz, 107.9MHz. 3.Indicator: Power LED 4.Voltage: DC 9-28V 5.Power source: 2 AAA batteries, Prepared with charger for vehicle