The main parameters Power supply voltage: DC10-24V single power supply direct current Frequency range: 22Hz-300Hz Audio input: single channel or dual channel Audio output: mono PCB specification: 78x32mm, thickness: 1.6mm PCB material: ultra-hard FR-4 glass fiber board Net weight of finished board: 30g Center spacing of plate fixing holes: 70x24mm, hole diameter: 3.2mm Center distance between potentiometer axis: 32.5mm