The self-excited PCB can dirve 1 to 4 transducers. Applicable for equipment of 25/ 28/ 33/ 40K/ 80KHz, etc. Input: AC 110/ 220V10% , 50/ 60Hz for option. Output: DC 300V Power: 50-250W Size: 157mm * 88mm; Positioning holes: 4* 5 mm