Greyghost 3.5mm Wireless Bluetooth Music Receiver with Mic Hands Free AUX Stereo Audio Adapter Dongle for Car Home SPEC: Bluetooth V 3.0 +EDR, range 33'(10m), 3.5mm stereo inlet socket, support A2DP V1.2 stereo profile. RECEIVER: Receive music from mobile phones or transmitters that feature bluetooth, listen to music from your smart phone or MP3 player on your existing home or car audio system. HANDS FREE: Answer phone call via the built-in Mic. POWER: Powered by built-in rechargeable li-ion battery via mini USB port, long working time and low consumption.Operation time up to 8 hours,sleep mode for energy saving. SIMPLE OPERATION: 3.5mm Male to Male Audio Connector or 3.5mm Male to Male Audio Cable to connect the speakers and the receiver.