Main Parameters: PCB's board is 2.0MM FR4 board The copper foil of PCB is 2 ounces PCB size: 78.5MM*62MM Working voltage: AC110-220V Relay protection current 30A, suitable for high-power amplifier boards Product weight: 0.1kg Product height: 35mm High-power amplifier speaker protection board Function: Direct AC 110-220V power supply, no need to add another power transformer Time delay protection Amplifier midpoint potential protection