1. The power filter capacitor adopts electrolytic capacitor 3300UF/50V 2. The main circuit of electrolytic capacitor signal adopts Taiwan famous , and the capacitor adopts electrolytic capacitor from Japan. 3. Resistance The main circuit adopts a five-ring metal film resistor with an accuracy of +/-1%, which ensures a good signal-to-noise ratio of the whole machine. 4. PCB adopts 1.6mm thick double-sided board, 2.0 oz copper thickness, and full tinning process to good passing performance of large and small currents. 5. The use of fully shielded audio special high-current inductors to a clear and powerful sound Working : Class D Quiescent current: 150mA Work efficiency: 90% Rated output power: 100W+100W+4 x 50W Frequency response: 20Hz to 20KHz Working voltage: DC18V to DC24V Net weight: 0.13KG colour:Blue Material:PCB size:100 x 84.5MM Package Contents: 1 Amplifier Board Only the above package content, other products are not included. Note: Light 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.