Bluetooth 4.1 Wireless Audio Transmission You can enjoy high-quality stereo audio by connecting to Bluetooth-enabled devices, like your smartphone, tablet or PC. Wired And Wireless Modes The device also works in wired mode by connecting the audio-USB cable. Useful when you run out of power. An empty battery will never stop you now. Built-in Microphone The hidden omni-directional microphone will automatically pick up your voice with remarkable clarity. Built-in Rechargeable Lithium Battery 20 Hours uninterrupted enjoyment after only 3 hours charging. The integrated lithium battery can also be recharged when you are using the headset. Fashionable And Customizable Available in a wide variety of stylish colors.The replaceable decorative cover design,allows you to create your own style. Connect two devices simultaneously Rapoo S100 headphone can be connect with two devices, such as Ipad and Iphone. System Requirements Windows or Mac OS computer with Bluetooth function A2DP Bluetooth devices including handphone£¬iPad and iPhone Headset Size: 158(L)*169(W)*67(H) + / - 0.5 mm Package Contents Bluetooth headset Micro USB cable A pair of decorative covers Quick start guide