This product is FM/MP3 Transmitter. It transmits output signals of various equipments (e.g. portable CD, DVCD, MD, MP3) with frequency modulation. These signals are received and played by automobile audio equipment. You can enjoy high-quality audio conveniently and economically. Technical Parameters Valid Range: 30m Operating Current: 40?0mA Operating Voltage:12V,24V Emission Power: 10mW Channel Isolation: ≧75db Output Frequency: 16 Frequencies between 87.7MHZ and 107.9MHZ Packing: Double Plastic Blister Net Weight: 50g (body) + 19g (wire) (exclusive of accessories) Gross Weight: 95g Size of Carton:50cm?9cm?0cm Gross Weight of Each Carton (50pcs): 5.5kg QTY: 50pcs/Carton Product Overview FM160 is a 16-frequency FM transmitter. It transmits output signals of various equipments (e.g. portable CD, DVD, MD, MP3, language repeater, voice pen, palm and PDAs) with frequency modulation. These signals are received and played by automobile audio equipment. You can enjoy high-quality music conveniently and economically. Adopted 3D sound decoding technology, it can reproduce high-quality audio signals from MP3, MD, CD and TV HI-FI equipments. It also introduces Phase Lock Loop (PLL) technology to ensure the stability of FM signal emission without any excessive frequency shift. Auto research is available, and 16 frequencies for your choice, avoiding the conflict with your local broadcasting stations. USB portal can be used to charge MP3. Enjoy your music anywhere!