Adjustable voltage range: The adjustable voltage range can be really smooth and adjustable from 10V to 220V, which makes it more suitable for devices that require low voltage to drive the heating wire Dual capacity design: The 220V voltage regulator adopts a amperometric capacitance + a metal film capacitance to absorb voltage surges and spikes, more efficient and safer to use Wide Application: Use to adjust the speed, brightness, voltage, temperature of various electronic devices, such as oven electric, water heater, lamps, small engine, etc. Why Choose Our AC Voltage Controller? Dual Capacitance Design: Adopt amperometric capacitance + metal film capacitance to absorb surge and voltage spike, more efficient and safer to use. durable performance: using high quality housing, which is made of 1.5mm thick aluminum and stainless steel, safe and practical. Easy to use: Easily control voltage, speed, temperature and more via the adjustable rotary knob. Specifications: Color: silver Material: aluminum + stainless steel Input voltage: AC 220V Voltage regulation: AC 10-220V Power: Max. 4000W Efficiency:> 90% Size: approx. 85 x 55 x 38mm/3.3 x 2.2 x 1.5in Package Weight: 127g Package List: 1 x Voltage Regulator Note: The charged power cannot exceed the specified maximum power, otherwise it will burn out the module and the electrical device.",