Features: Use original IRF240 MOS tube. The input coupling capacitor is 50V / 3.3UF imported from Germany, and the main circuit of the electrolytic capacitor signal is imported. The resistor uses five-ring metal resistors, and the main circuit uses five-ring metal film resistors with an accuracy of ± 1% to ensure a good signal-to-noise ratio for the whole machine. The PCB uses 1.6mm thick double-sided sheet, 2.0 oz copper thickness, and the whole process of spraying tin to ensure good passing performance of large and small currents. Best-in-class PCB quality. The wiring layout of the entire circuit board is quite rigorous and reasonable, and the overall PCB routing adopts a little grounding method. The power amplifier board works stably and reliably with high output power; the sound is beautiful and round, and the sound field is wide. Strong three-dimensional sense, stable and solid low frequency, excellent signal-to-noise ratio, wide dynamic range; clear details, excellent transient response, all kinds of music can be handled freely, and it has a very good performance in the home playback environment. Specifications: Material:ABS Power supply: + -35V to + -45V Power: 100W (±45V 4ohm)/ 1-channel Distortion: THD is 0.012% into 1 kilohertz and full power THD is 0.015% into 10 kilohertz and full power Package Includes: 2xAmplifier Board note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!