Description Features: x Wireless BT 4.1 ensures transmitting strong signal in high quality and high speed, delivering high-fidelity stereo music. x With magnetic suction function, and when do not use headphone, you can wear the headphone on the neck to avoid its falling. x Built-in microphone enables hands-free calls to set free your hands when doing sports. It also supports multi-point connection technology. x With line control buttons, easy to control playing or pausing, adjusting the volume, previous or next songs, answering or rejecting or ending calls. x Ergonomic design guarantees wearing stable and comfortable when exercising, running, climbing and other outdoor sports. Specifications: BT Version: 4.1 Support: A2DP, AVCTP, AVDTP, AVRCP, HFP Working Distance Range: 10m Frequency Responce: 20-20KHz Impedance: 16 Sensitivity: 94dband-3db Battery: 3.7V or 60mAh (350926) Charge Time: about 2 hours Standby Time: about 100 hours Talking Time: 2.5-3 hours Music Time: 2.5-3 hours (The music volume will affect the time) Charge Port: Micro USB Color: Black, Gold, Blue, Silver (Optional) Cable Length: Approx. 70cm or 2.29ft Headphone Weight: 12g or 0.42oz Package Size: Approx. 9.0 x 7.0 x 2.0cm or 3.54 x 2.75 x 0.78in Package Weight: 26g or 0.91oz