If you are someone who need to talk to others by mobile phone when driving, this wireless headfree car kit is a quick, short-range (about 1 meters) and inexpensive solution for you. Easy to operate, all you need is swith on the power buttom, tune the Radio frequency of your car(exactly as the unit). You could hear incoming call in your car Radio system. When you have this headfree car kit, you have a better chance to enjoy safe driving and nice online conversation. (1)Simple clip-on universal transmitter. (2)car FM radio receiver. (3)Frequency: 88.9/106.7MHZ (4)3V Battery included. (5)No installation necessary. (6) Universal type for all models cell phone. (7)Available distance for transmission around 3 meters (8)Available distance for transmission around 3 meters (9) 1 PC 2032 standard cell