INSTRUCTIONS FOR USE - The Device is Bluetooth music receiver that connects to any stereo audio input. Now You can listen to music from your phone the receiver into the speaker's USB interface, and the other end connected with the 3.5mm audio cable to the receiver and the aux interface of speakers. Open the Bluetooth-enabled mobile phone , laptop and any stereo audio input without the hassle of cables. The Bluetooth can connect to Home A/V systems, home stereos, headphones, automobile, or motorcycle speakers, Boats, Rvs and more. it will automatically search for a compatible, transmitter. No any codes to enter if connect with Apple or Android devices. To complete, pairing some devices require a pass key or code, use "0000" LED lights beneath the button indicate device connection and charging status. The included stereo cables and adapter connect the Bluetooth to any receiving device with a headphone jack.