1.Correspond With V2.1+EDR 2.Frequency Range:2.4026GHz-2.480GHz 3.Easy to charge by USB- ... ) 3,Transmitter Power: Class 24,Operation Distance: Within 10m5,Frequency range: 2.4026-2.480GHz6,Embedded rechargable Li-batteries:450mAh7,Charger ... ,Standby time:≥180hrs12,Headset Size: 171*159*69mm13,Weight: 138 g Stylish Wireless Stereo Bluetooth Headset (B-907)