The recommended working voltage is AC dual 35V, and its output power is 100WX2@6 Ω (=0.05%) The recommended working voltage is plus or minus 45V, and the maximum working voltage should not exceed plus or minus 52V. (According to official data). It is very simple to use, and the finished board has been tested and found to be OK. There is no need for debugging, as long as a transformer and heat sink are added, the sound can be heard; DIY, upgrading and modifying old speakers, and amplifiers are choices. Use relay+ output inductance. NOVER and Japanese NCC filter capacitors. : Power supply voltage: AC dual 24~36V Output power: 100W+ 100W@6 Ω (measured undistorted power under DC50V power supply) Different batches may have different appearance, which does not affect use. Material: PCB+electronic components colour: green+black Package Contents: 1 Amplifier Board 4 x Copper post nuts 2 x screws 1 x three-core shielded wire 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.