Features:Connection Type : Bluetooth V2.1 USB 2.0 Built-in Battery, USB Charging Come with a USB cable Working Distance: about 10 Meters Support System : Windows 98/2000/XP/Vista, Win 7,  8Fashionable design for you, you will not miss any phone call with it. Portable behind-the-head wearing design,

Features:Connection Type : Bluetooth V2.1 USB 2.0 Built-in Battery, USB Charging Come with a USB cable Working Distance: about 10 Meters Support System : Windows 98/2000/XP/Vista, Win 7,  8Fashionable design for you, you will not miss any phone call with it. Portable behind-the-head wearing design, very convenient for Sports. Usage:Press the middle button For about 10 seconds till the red and blue light flash alternately. Turn on the bluetooth device of your cellphone, and searching the bluetooth device named LSD-5011D.