Make your car aux audio system and home theater av hifi surrounding system become bluetooth compatible, get music from bluetooth enable device such as cell phone or bluetooth pc, laptop, etc. Simply connect this bluetooth audio receiver toyour line-in or auxiliary input on your speakers, pair it to your bluetooth enabled device, and enjoy the wireless music revolution it connects to your smartphone automaticallyonce it is turned on powered by built-in rechargeable li-ion batteryvia mini usb port, long working time and low consumption (mini usb cableincluded) high-performance amp chip, can push the headset, and high-power speaker, applicable to all types of speakerssleep mode for energy saving. Specification color blackbluetooth v3.0+edr, class 2support bluetooth hands-free functionbluetooth stereo audio profile a2dptransmission distance up to 10m.