1. Adopt TPA3116*2, NE5532 2. The power supply filter capacitor adopts 4 1000UF/25V electrolytic capacitors. 3.The PCB adopts 1.6mm thick double-sided board, 2.0oz copper thickness, and the whole process of tin spraying to good passing performance of large and small currents.First-class PCB quality. 4. The special inductance of the shielded power amplifier is used to that the sound is crisp and powerful. 5. The potentiometer adopts a high-quality fully sealed potentiometer, which has a better dust-proof effect and is more ! Potentiometer from left to right: treble and bass volume Working : Class D Quiescent current: 50mA Work efficiency: 90% Rated output power: 2*100W Frequency response: 20Hz to 20kHz Working voltage: DC18V-DC24V, 3A or more, recommend DC24V 4A switch supply power. Colour:As Shown Material:PC+metal Package Contents: 1 x TPA3116 Audio Amplifier Board 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.