Type 1: 2000W 100% Brand new and high quality.Connect this device with lamp or home appliance in a series connection, then rotate the knob for dimming, speed, voltage, temperature control.Applicable appliance: electric furnace, water heater, lamps, small motor, electric iron etc.Input voltage: 220V.Maximum power: 2000W.Adjustable voltage: 50-220V AC.Material: plastic, metal.Size: 4.8cm x 5.5cm x 2.7cm.Package Included:1 x 2000W 220V AC SCR Electric Voltage Regulator Type 2: 3800W Material: plastic and metal.Input voltage: AC 220V.Output power: Max 3800W.Adjustable voltage: 0-220V AC.Connect this device with lamp or home appliance in a series connection, then rotate the knob for dimming, speed, voltage, temperature control.Applicable appliance: electric furnace, water heater, lamps, small motor, electric iron etc.Size:6x 3.6x 4.3cm.Net Weight: Approx 77g.Easy and convenient to use. Package Included:1 x Dimmer Dimming Speed Controller Switch AC 3800W SCR Electric Voltage Regulator Type 3:4000W Features:Special design with 1.6 thick FR - 4 high temperature resistant circuit board.It is safety and reliable to cope with large current.Double capacity design: Safety capacitor and Metal film capacitor to protect SCR more effective.More efficiency and more safety.1.5 thick aluminum and stainless steel case, more suitable for family temperature control or speed control and industrial enterprises to use.Beautiful and easy, safe, convenient, high quality products. It will not rust after long time using.Mainly fit for the resistive loads, eg. lights. It also works with the single phase brushed motor which the max power can NOT be over the 1/3 of 40000W. Specifications: Voltage range:10V-220Vmaximumpower: 4000wNet Weight: 41.8gWorking voltage: AC 220VRadiator fin size: 48 x 35 x 30mm Package included:1 x SCR electronic voltage regulator speed controller