Features 1.Professional Manufacturing: It is a 500W class D sound amplifier, mainly used in home theater and with speakers. 2.Circuit Optimization: Single channel class d sound amplifier board adopts circuit optimization and adds speaker relay protection. 3.Unique Design: Digital amplifier board: can turn on the delay, turn off the instantaneous break, effectively solve the switch on and off the shock sound. 4.Relay Power Supply: Digital stereo power amp module with its own relay power supply, external 110V 220V AC can be. 5.Premium Material: Single channel class d sound amplifier board using PCB material, high density, safe and reliable, aging resistance. specificationItem Type: Digital Power Amplifier Board_x000D_ Material: PCB_x000D_ Power Amplifier Plate Size: Approx. 105x43x28mm / 4.13x1.69x1.10in _x000D_ Supply Voltage: Dual DC Power Supply 45 - 70V (Recommended +-65V Power Supply Can Be)_x000D_ Rated Output Power: 500W (65V Power Supply 4 Ohm Load, Distortion 1%)_x000D_ Efficiency: >= 90%_x000D_ SNR: 90db_x000D_ Total Harmonic Distortion:_x000D_ 380W (70 Powered 4 Ohm Speaker, Distortion