we are a major manufacture in designing and producing bluetooth headset, bluetooth dongle(adapter), irda wireless connection and some bluetooth series products. we have our factory in shenzhen ,china. email: david at sun-usb.com msn: sun-usb-david at hotmail.com ------------------------------------------------------------------ 1、chipset：csr bc313143a 2、bluetooth spec:v1.2 3、frequency range:2.402hz-2.480ghz 4、receive sensitivity:-80dbm 5、tx power:0dbm 6、range: 100m 7、input pwoer 5v from usb port 8、operating channels:79 channels of 1mhz bw 9、host interface(usb):usb spec 1.1 complient 10、operating temperature:-20℃-75℃