[Strong BT Technology]: Support A2DP and AVCRP protocol, bring you clear music sound and cell phone music control. The wireless headset for BT enable cellp phone at a range up to 10 meters. Bike-to-bike intercom for rider and pillion or two seperate bikes up to 800-1000 meters, even your distance is 1000 meters, you two can also talk to each other.[Multipul Calling Functions]: Support call out, call answer, call reject and call hangup. It can recieve phone call automatically and last number can be redialed.[Ultra Clear Voice]: DSP is mainly aimed at high and low frequency noise in the external environment, which significantly improves the quality of the call and the sound of the headphones.