Bluetooth Headset BH-538:
1)Chip:CSR2)Transmission distance:10M3)Bluetooth version 2.04)The smallest and the lightest weight Bluetooth wireless headset 5)Fashion and stylish design6) Friendly user's interface 7) Frequency range: 2.4GHz-2.48GHz8)Transmission distance: 10M9)Operating voltage: 3.6V Operating current: <35mA Standby current: <2mA10)Charging time: 1-2 hours11)Talking time: 3-4 hours12)Standby time: 100 hours13) Color:black, silver