Product Description: Are you still worried about these problems? Power tools running too fast, furnace filaments getting too hot, or light bulbs shining too brightly. With this GRDM AC Motor Speed Controller, you can adjust speed, temperature, voltage, and brightness. Key Features of GRDM Fan Speed Controller: Metal shell with cooling holes for good ventilation and heat-dissipation. High-precision knob for quick speed, voltage, temp & brightness adjustment. Comes with LED voltmeter for easy voltage view and fast adjustment. 4 Mounting Holes for wall-mounting in specific scenarios. Works seamlessly with both 120 V and 220 V power sources, ideal for global use. Specification: Sold By: GRDM Name: High Power SCR Variable Speed Controller Color: Black Material: Metal Weight: 680 gram (1.49 pound) Dimension: 15.5 x 6.1 x 13.6 centimeter / 6.1 x 2.36 x 5.11 inch Cord Length: 1 meter/39.37 inch Input Voltage: AC 110 Volt/220 Volt Output Voltage: AC 10-110 Volt/10-220 Volt (adjustable) Rated Current: 22 Amp Maximum Current: 44 Amp Disable Device: 1. Some motors do not support voltage regulation, such as single-phase motors, dual-value capacitor motors, asynchronous motors, pumps, negative pressure fans, centrifugal fans, etc. 2. Devices like air pumps, water pumps, microwaves, rice cookers, LED energy-saving lights, LED diffuse lights, etc. Motor Equipment Can Only Be Adjusted: 1. Fans and exhaust fans without capacitors. 2. Power tools: hand drills, angle grinders, electric screwdrivers, etc.