HBS 730 Bluetooth Wireless Sport Stereo Headset Neckband , with additional Features: Unique ring-necked design, opening up a new era of Bluetooth, Ultra-light elastic memory material, easy to carry, Vibrate to remind you not to miss any incoming calls, High-fidelity stereo audio earphones enjoy entertainment, Intelligent noise reduction, clearer calls, Long standby, long call. Compatible with standard Bluetooth- enabled mobile phone, media devices. Answer/end/reject a call. Last number redial, voice dialing, transfers a call, call waiting. Specifications: - Bluetooth version: 4.0+ EDR, Battery: Battery 3.7V/180mAh, Charging time: lt;2 hours. Best for Running, Gyming other Outdoor Activity.