Blue-tooth Description: Support all blue-tooth mobile phone, either headset or hands free. Perfect rings display Display mobile!/s individual rings and chord rings First design of silence, transferred freely from !0calling!1 and !0silence!1 Single key performs function of !0receiving, end, reject, redial, voice dial, call waiting, etc.!1 Volume higher and lower key performs volume adjustment stepless. Connection sets up automatically after power off. One wire to charge: USB connector, directly charged from computer. Colorful: 5colors in total.