TDA8920 Digital Stereo Audio Amplifier OCL 80W2 Power Amp Board BTL 160W DIY Module Name: digital amplifier board DIY kit; Product Model:TDA8920BTH; Chip efficiency: exceed 90%; Operating voltage: 15V - 27V(Recommend voltage:  20V -  25V ); Maximum output power: OCL = 80Wx2 (4ohm  27V) ; BTL = 160Wx1 (8ohm  27V); Decoupling capacitors: two pieces 2200uF/35V; Input hole spacing: 2.5mm; Output hole spacing: 7.6mm; Short-circuit the "K" to change to BLT mode; The load of BTL mode is 6-8 Europe, if 4 ohm , it is recommended that the supply; voltage of  15V to  22V; Package Includes: 1x finished amp board