we are a mamufacturer to design and produce usb data cable,irda wireless connection ,bluetooth usb dongle( adapter ) ,bluetooth handfree,usb hub,card reder , pc camera ,usb fan ,usb light and some usb series products, for more details please visit http://www.sun-usb.com email: david@sun-usb.com msn: sun-usb-david@hotmail.com ------------------------------------------------------------------------------ bluetooth specification:version 1.1 bluetooth profile supported:headset and handsfree profiles range of frequency:2.4ghz spectrum dimensions:50.8mm(h)*42mm(w)*22mm(d) nominal charging time:within 3 hours talk time:up to 4 hours standby time:up to 160 hours weight:24 grams