1、Adopt lead-free environmentally friendly ROHS process. 2、Finger size: Suitable for small space embedding. 3、Boot up without annoying sound. 4、There is no current sound in the work of the amplifier. 5、The CS control shutdown current is only 0.4mA. The quiescent current is 28mA. Features: Adopt lead-free environmentally friendly ROHS process. Finger size: Suitable for small space embedding. Boot up without annoying sound. There is no current sound in the work of the amplifier. The CS control shutdown current is only 0.4mA. The quiescent current is 28mA. High gain amplification (36DB). Ideal for weak signal amplification, no need to add preamps, thus reduce costs. With output short circuit protection. Troubleshooting immediately resumes normal operation. Specification: Product Name: Power Amplifier Module Specifications Model: OEP50Wx2 amplifier Working method: Class D (PW modulation) Chip selection: TPA3116D2 (import) Number of sound channels: two sound channels Power supply range: DC5-24V Amplifier gain: 36dB (20DB, 26DB can be set) Input impedance: 1K Ω Output impedance: 8-3.2Ω Output Power: 40W THD+N=10%(89Ω,24V) 30W THD+N=10%(89Ω,21) 50W THD+N=10%(49Ω,21V) 25W THD+N=10%(49Ω,15V) 17W THD+N=10%(49Ω,12V 32W THD+N=1%(89Ω,24V) Quiescent current: 28mA (21V power supply) Shutdown current: <0.4mA (21V power supply) Recommended audio: 50-100 Signal to noise ratio: 102dB Harmonic distortion: <0.1% Frequency response range: 20Hz-20kHz2 Working temperature: -40-85 °C Cooling volume: 12V power supply does not require heat dissipation. Appearance size: approx. 25x20x2.2mm / 1x0.8x0.1 inch (L*W*H) Protection function: Output short circuit protection Package List: 1 x Power amplifier board Note: 4 ohm speakers are not recommended for power supply greater than 21V. Output exceeding 17W requires heat sink. The computer audio input must be changed to 20DB gain.