Using TPA3255DDVR The electrolytic capacitor adopts brand-name capacity 470UF/50V*8, which ensures strong and continuous . The resistors are high-precision chip resistors to a good signal-to-noise ratio of the whole machine. Use special magnetic ring inductors for audio to the sound is crisp and powerful. PCB adopts 1.6mm thick double-sided board, 2.0 oz copper thickness, and full tinning process to PCB quality with good passing performance of and small currents. Basic performance parameters: Working : Class D Quiescent current: 300mA Work efficiency: 90% Output power: 600W/2ohm, distortion 10% Frequency response: 20Hz to 20KHz Dynamic range: 100 dB Signal to noise ratio: () 111dB Working voltage: DC24-48V switching power supply (DC) Colour:black Material:plastic Package Contents: 1 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.