Hand-free car-kits Model: ZTM-318 Commodity: Wireless hand-free car-kits Frequency: 88.7/106.4MHZ Power: 3.6V H charger battery RF output power: +5DBM Valid transmit distance:3M Packing: Suction plastic More frequency for your choice, which can set up at random Mate with vehicle charger which is convenient to charge up power, all other DC vehicle charger are available. Hand-free talking is available through vehicle acoustics or product with acoustics, has clear timbre.