The power supply requires tens of amps, so please use thick wires! Thick line! Thick line! Avoid loss leading to insufficient power supply. Input voltage: 10-15V, if it is lower than 9.6V, it will enter the protective shutdown state; Output voltage: This machine is a shallow closed-loop circuit. The output voltage will change with the input voltage. It is about 44.5V at 12V input and about 50V at 13.5V input. The output voltage is an approximate value and will have a deviation of 1-5V. The power supply of the power amplifier is a wide voltage. , it doesn't have to be an exact value. If you mind about this, please don't ! REM is the control terminal, where a switch or the car's ACC terminal can be connected to control the power on and off. Colour:Photo Color Material:plastic Package Contents: 1 x High-Power Amplifiers 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.