Features:It can easily adjust the output voltage on a scale of 0-100 percent (nonlinear) to power electric device.Designed with large and thick heat sink that would enhance heat dissipation.This voltage regulator is adjusted with button which is much more stable than potentiometer.Voltage regulator has wave voltage absorbing circuit and effective protects large power silicon controlled rectifier, longer service life and more durable.It can be used as power supply for large electrical devices of less than 8000W, enough for household appliances or for small factory.Could be widely used as heat controller on electric stoves, water heaters, light dimmer on lamps, speed controller on small motors, or temperature controller on electric soldering iron, etc.Specification:Voltage: AC 220VMax Power: 8000W(instantaneous limit power for impedance load for long time use, 4000w or lower is recommended)Voltage Adjustment: 0-100 percent (nonlinear) (0,30,35,40...100)Controller Size: Approx. 9.7x5.7x4.3cm or 3.8x2.2x1.7inchPanel Size: Approx. 7.5x6x1cm or 3x2.4x0.4inchCable Length: Approx. 30.8cm or 12.1inchFix Screw Hole Spacing on Panel: Approx. 6x4.5cm or 2.4x1.8inchWeight: Approx. 195g or 6.9ozPackage List:1 x SCR Controller1 x ABS Panel1 x Panel Sticker1 x CableNote:1. AC input, AC output, only for stepping down voltage can be adjusted only when connected to load mainly used for resistive load.2. It cannot replace electric bicycles' battery charger, nor drive electric appliances which use switch power supply (such as 110V TV, speaker, refrigerator, air conditioner, rice cooker with a computer), and cannot drive induction cooker, energy saving lamp.