we promise: professional products, high quality, competitive price, best service in the world!
Specifications:
Compliance with Bluetooth Specification Version 1.1or 1.2~~~
Support Headset and Handsfree Profiles~~~
Support RF Power Class 2~~~
Wireless connectivity up to 10m~~~
Support Rechargeable Lithium-Polymer Battery with~~~
built in charging circuitry
Operating frequency range in ISM band of 2.4GHz to 2.48GHz
LED status indication for different mode of operation
DC Power Input Requirement: 4.8V to 6.0Vdc(400mA) 
110-220V AC adapter
Talk time : up to 5 hours
Standby time: up to 120 hours Nominal Charging time:in 2 hours
Highly quality:Use CSR chip ( A class )