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, Compatible with standard Bluetooth-enabled mobile phone, media devices. Answer/end/reject a call. Bluetooth version: V4.0, Battery: Battery 3.7V/180mAh, Standby time/Talk time: Up to 30 hours/ up to 1 hour, Music play time: Up to 8 hours, Charging time: 30 MINS.