Features: Compliant with Bluetooth V1..2,V1.1 ,Specification Support Bluetooth Headset and Handsfree profiles Easily and freely for placement Smart appearance Low radiation Rechargeable lithium polymer battery for power supply Powerful functional echo-clearing circuit Long standby time High quality of voice communication Voice dialing Lowest power consumption Simply operation LED indicator and tone alert for headset status General Specifications: Frequency Range: 2.4GHz~2.4835GHz unlicensed ISM band Output Power: Less than 4 dBm (class 2) Operation Range: Up to 10m (30 feet) outdoor Security: Pairing, encryption, authentication Voice Performance: Full Duplex ratio: 99%; Noise Suppression ratio: 95%(at talk) Power Consumption: Standby 5 mAh (12V); Active Max 250 mAh (12V) Battery: Li-Polymer battery 750 mAh Dimension: 90x55x26 mm Stand-By Time: 250 Hours Talk Time: 5 Hours