Compliance with Bluetooth Specification Version 1.1 Support Headset and Handsfree Profiles Wirelessly connects to most Bluetooth mobile phone 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. Two buttons control. An answer/end button supports voice activation