Features: Use original TPA3116 and TL074 The electrolytic capacitor signal main circuit adopts a patch electrolytic capacitor with a capacity of 4×470UF, which ensures strong and continuous power support. High-precision chip resistors are selected for the resistance to ensure a good signal-to-noise ratio of the whole machine. PCB adopts 1.6mm thick double-sided board, 2.0 oz copper thickness, and full tin spraying process to ensure good passing performance of large and small currents. First-class PCB quality. Adopting fully enclosed dustproof potentiometer, the performance is more stable, and it is more durable than ordinary potentiometer!Fully shielded high-current inductors are used to ensure a clear and powerful sound. Specifications: Material:Metal Working method: Class D Quiescent current: 50mA Work efficiency: 90% Rated output power: 2x50W Frequency response: 20Hz to 20KHz Working voltage: DC18V to DC24V Maximum output current: 2A Size:Approx. 80x 80x40MM Package Includes: 1x TPA3116 TL074 2x50W Digital Tone Power Amplifier Board D-50A note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.