This is a must have AC EMI filter that is for a laser machine or for other sensitive electronics device. You may not know that the electricity current from the power line is very 'dirty'. There is a lot of "high-pitched" noises that is mixed up with the power, and it may lead to device failure or malfunction without a filter.
Specification - Voltage: AC 110V~240V, 50/60Hz - Current: 10A