Specifications:
1) Range of frequency: 2.4GHz ISM spectrum
2) Talk time: up to 3 hours
3) Standby time: up to 120 hours
4) Nominal charging time: within 2 hours
5) Security: pairing, encryption and authentication
6) Pico net: point to point
7) Compliance with Bluetooth specification Version 1.1
8) Wirelessly connects to most Bluetooth mobile phone support RF power
class 2
9) Wireless connectivity up to 10m
10) Support rechargeable lithium-polymer battery with built in charging
circuitry
11) Battery voltage: 3.7V DC, 120mAh
12) Support profiles: headset and handsfree profiles
13) Operating frequency range in ISM band of 2.4GHz to 2.48GHz
14) Two buttons control: answer/end button supports voice activation
15) DC Power Input requirement 6.6V DC to 7.0V DC (400mA) 100~240
16) AC adapter: 6.6V DC to 7.0V DC (400mA) 12-24
17) DC car charger: 5V DC USB cable PC charger
18) Output power class: class 2

Inner packing: boxes