The input voltage is DC 10-15V, and the test conditions are 12V as an example: The output main voltage is plus or minus 73v, and the auxiliary voltage is plus or minus 12v/1. The open-loop circuit has no voltage stabilization, and the main output voltage will change with the input. The marked output voltage value is an approximate value, and there will be a deviation of 1-3V. The power supply of the power amplifier is a wide voltage, and it does not need to be an accurate value. If you mind about this, please don't ! The power supply requires tens of A current. Please use thick wires to avoid loss and insufficient power supply. 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.