The main circuit of the electrolytic capacitor signal adopts a chip electrolytic capacitor with a capacity of 4x470UF, which ensures a strong and continuous . The resistors use high-precision chip resistors to a good signal-to-noise of the whole machine. The TPA3116 PCB is made of 1.6mm thick double-sided board, 2.0 copper thickness, and full tin spraying process to good passing performance of and small currents. Top- PCB quality. Using a fully enclosed dust-proof potentiometer, the performance is more stable and more durable than ordinary potentiometers Fully shielded high-current inductors are used to clear and powerful sound. 1. Working : Class D 2. Quiescent current: 50mA 3. Work efficiency: 90% 4. Rated output power: 100W 5. Frequency response: 20Hz to 20KHz 6. Working voltage: DC18V to DC24V 7. Maximum output current: 4A Model: TPA3116 Type: Bluetooth power amplifier board module Type: power amplifier board Type: Audio Power Amplifier Type: digital power amplifier board color:Black :plastic size:135 x 90 x 40MM Package Contents: 1 x Digital Amplifier 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.