Two wires connecting the speaker to the audio output port of the power amplifier, left channel loudspeaker connected to the amplifier ports LOUT Right channel loudspeaker connected to the port, is connected to the positive "+", a negative electrode connected to "-." It is connected to the . Audio cable with 3.5mm stereo headset plug, and 3.5 stereo headphone jack insert amplifier. The other end of the audio cable to the audio source (such as computers, mobile phones, MP3, DVD). Into the power, the power lamp light blue, which means that the power amplifier to work the plate. You can adjust the volume knob to your . Size: 60 x 56 x 50mm Output Power: 35W + 35W Power: DC 9-15V / 50-100W Channel Type: Stereo 2.0 Frequency response: 20Hz-20KHz Supporting speakers: 4-8Ω20-120W 3 inch - 10 inch bookshelf speakers, Acoustic speakers Color: As Shown Material: Plastic+Metal Package Contents: 1 * Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.