Make your car AUX audio system and home theater AV HiFi surrounding system become bluetooth-compatible compatible, get music from bluetooth-compatible enable device such as smart cell phone or bluetooth-compatible PC, laptop. Simply connect this bluetooth-compatible audio receiver to your line-in or auxiliary input on your speakers, pair it to your bluetooth-compatible enabled device, and enjoy the wireless music revolution. Whether you want bluetooth-compatible convenience in your car, through your home-theater system, in your kitchen, bathroom, or bedroom, etc. Simple operation, 3.5mm male to male audio cable to connect the speakers and the receiver. High-performance AMP chip, can push the headset, and high-power speaker, applicable to all types of speakers. Powerful bluetooth-compatible IC, more stronger compatibility. You can play music through your car stereo and answer phone call via the built-in mic. Operation Steps: For no USB port speakers: supply power to the device by connecting charger with DC 5V USB interface, then connect the speakers AUX port with the audio cable. For speakers with USB port: connect the device with speakers USB port directly, then connect the speakers AUX port with the audio cable. Turn on the bluetooth-compatible function of computer, mobile or other device which has bluetooth-compatible function, searching for the device to connect. After matching success, you can use your phone to play music. Type: bluetooth-compatible Music Receiver Color: Black Bluetooth: 2.0 and EDR Power Supply: via USB Port Output Mode: 3.5mm Audio Interface Transmission Distance: 10m Size: 5.5cm x 2cm x 1cm or 2.17" x 0.79" x 0.39" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 4 x 1 x bluetooth-compatible Music Receiver(This item is just the receiver device) 1 x 3.5mm Stereo Audio Cable 1 x User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.