Features: * Wireless BT 4.1 ensures transmitting strong signal in high quality and high speed, delivering high-fidelity stereo music. * With magnetic suction function, and when do not use headphone, you can wear the headphone on the neck to avoid its falling. * Built-in microphone enables hands-free calls to set free your hands when doing sports. It also supports multi-point connection technology. * With line control buttons, easy to control playing / pausing, adjusting the volume, previous / next songs, answering / rejecting / ending calls. * Ergonomic design guarantees wearing stable and comfortable when exercising, running, climbing and other outdoor sports. Specifications: Model Number: XT-11 BT Version: 4.1 Support: A2DP, AVCTP, AVDTP, AVRCP, HFP Working Distance Range: 10m Frequency Responce: 20-20KHz Impedance: 16Ω Sensitivity: 94db+-3db Battery: 3.7V / 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 / 2.29ft Package List: 1 * BT Headset 1 * USB Cable 1 * User Manual