Description: - Bluetooth Version: v2.1 - Chipset: CSR BC6 V2.1 - Support: Headset,Head free,Noise-Canceling,Voice-Dial/Mute - Ear Coupling: Over the ear - Talk Time: 20 Hour - Standby Time: 350 Hour - Operating Range: 10 meter - Compatibility Bluetooth: v2.0 & 2.1 - Microphone: Yes - Radio: N/A - Power Supply: Built-in battery - Built-in Battery Capacity: 250mAh - Compatible With: All Bluetooth wireless technology enabled phones. Other Features: Clear and high quality voice for both talking party. Voice-dialing, re-dialing, refusal of incoming call function. Volume adjustable. Note: the headphone doesn't support A2DP, It can't be used to listen to music. Packing List : 1 x Bluetooth headphone 1 x USB charging cable 1 x English user manual