Instructions for Use: 1.Please connect the battery positive,Don't just connect a positive line casually, or it Burn out circuit. 2.The GND interface must be connected to the negative pole,ground connection is OK. 3.Be sure to connect the REM interface.when you test the amplifier,you can connect with power ground +12V.And then,you should find the ACC control wire interface which on your CD player, if the Player has no this interface,you can connect the ACC line that on the key switch.Make sure don't the iron, or it short-circuit. 4.If you find the indicator light is red when you wiring,please unplug the power immediately and reconnect.If the red light lasts for five minutes,the protection of the amplifier burn out.The blue light is normal. Description: 1.MAX Power Rating : 4 ohms: 1200 watts x 2 2 ohms: 1900 watts x 2 2.RMS Power Rating: 4 ohms: 800 watts x 2 2 ohms: 1300 watts x 2 3.LED power indicator 4.Low pass filter 5.Metal case 6.Input:12V Color: Black Material: plastic Package Contents: 1 x audio amplifier 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.