Technical Parameters Valid Range:15m Operating Current: 40?0mA Operating Voltage:12V，24V Emission Power: 10mW Channel Isolation: ≧75db Output Frequency: 106.7,107.1,107.5,107.9MHZ (frequency can be set as per request) measurement：50*39*20cm Quantity/Ctn：50pcs/Ctn GW：4kg Product Overview MR-040 is a four-frequency FM transmitter. It transmits output signals of various equipments (e.g. portable CD, DVD, MD, MP3, language repeater, voice pen, palm pc and PDA) with frequency modulation, then these signals are received and played by automobile audio equipment. You can enjoy high-quality audio conveniently and economically. Adopted 3D sound decoding technology, this unit is capable of reproducing high-quality audio signals from MP3, MD, CD and TV HI-FI equipments. It also introduced Phase Lock Loop (PLL) technology to ensure the stability of FM signal emission without any excessive frequency shift. Use guidance Make sure connect the audio cable attached with earphone jack of music player equipment, and insert this unit into car lighter, then startup sound resource or car speaker, turn the FM transmitter and radiogram into same frequency. If you want to change the frequency, adjust the switch aside of unit into the accordingly frequency, then turn radio into accordingly frequency.