DROK&reg; TDA8920 HiFi Digital Power Class-D Amplifier OCL 2-channel 80W*2 Ampli BTL Mono 160W Stereo Audio AMP Kit for PC Speaker CD MP3 This digital amplifier board uses TDA8920BTH chip, has high efficiency(can exceed 90%). Maximum Output Power: OCL = 80Wx2 (4ohm +/- 27V) ; BTL = 160Wx1 (8ohm +/- 27V). Operating Voltage: DC Dual +/-15V to +/-22V (Recommend Voltage: +/-20V to +/-25V ). The radiator is after oxidation treatment to ensure best performance, which makes working more stable. Has many advantages, compact design, large power, low noise and long performance life, etc.