No wires, no limits, Bluetooth TM wireless technology *Bluetooth v1.2 *Frequency between 2.4GHz and 2.483GHz. *Range: up to 10 meters *full compatible （Headset Profile／Handfree Profile） *Security: encrypted link *Support Mobile phone voice dial function. *Easy one-touch operation *True freedom to talk wirelessly in office or in car *Volume adjustable, mute function. *Noise reduction, echo elimination *LED direction. *Talk-time: 3.5 hours *Standby time: 100 hours *Weigh:16g Origin cn Delivery lead time 10days Minimum order 500pcs