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Voltage: AC 220V; Max Power: 4000W; Voltage Regulation: AC 0~220V; Efficiency: 90% or more; This product is suitable for adjusting electrical appliances output voltage between 0~220V; Suitable for electrical appliances£¬ such as electric stove£¬ hot water heater adjustment£¬ dimming lamps£¬ small motor speed£¬ electric iron temperature controlled and so on£¬ so as to achieve thermostat£¬ pressure£¬ speed effects. Usage: This product input connected to 220V AC£¬ output is connected to the electric wire or electrical appliances£¬ rotary potentiometer rotating rod£¬ you can play a thermostat£¬ pressure£¬ speed effects£¬ easy to use. Note: The load can not exceed the specified maximum power£¬ otherwise it will burn modules and appliances£¬ try to use a resistive load.