This receiver is designed to receive music from mobile phones or transmitters that have Bluetooth. Can be used with almost any audio receiver with to audio input, including the car. Ideal for play calls or use it as handfree on to call. Features: Bluetooth 3.0 + EDR. Button Type One Touch Connect (on and easy connection). Transmission Distance: 10m. Built-in microphone. Hands free. Blue LED and Network LED. Profile stereo audio: Monophonic. Frequency: 2.4GHz. Input jack 3,5mm stereo output jack. Embedded battery. Battery life: Up To 2 hours. Can be used with an AC while charging to increase the duration of use. Sleep mode to save battery. Micro USB port to charge the receiver. To synchronize the receiver to to device, hold the button for 5 seconds until flashlight network LEDS and blue. Find the music receiver on your mobile phone or compatible transmitter. Choose the receiver and wait until it synchronized. Lights receiver will blink more slowly. On some devices will need enter key 0000. IMPORTANT: This item is to receiver, the device receives audio through the Bluetooth and passes it through the Jack plug to to device with AUX input, so it IS NOT VALID for use as emitter TVs or other devices that have to Jack output (For example want use it to listen TV headphones Bluetooth).