Connect this device with a lamp or home appliance in a series connection,

then rotate the knob for dimming, speed, voltage, or temperature control.
Applicable appliances: 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.