Our product description:Items color may be different from the picture due to the aberration. Specification: Advanced circuit design, adopting resistive load, 0-220V precisely adjustable without hysteresisWorking voltage: AC 220VMaximum power: 4000W (connected resistive load) Voltage regulation range: 0V-220VProtection: anti-spike, overvoltage, RC absorption (eoc) Applicable to electric furnace, Water heater, lamps, small motor, iron etc Dimensions: 91 X 59 (Without button) Weight: 174g How to use: Connect this product to AC 220V power, connect the output to lamp or home appliance or electrical circuit, then turn the button for dimming, speed, voltage, temperature control Note: The load must not exceed the specified maximum power, otherwise it will burn the module and the devices; use the ohmic measuring load; inductive, capacitive load power is greatly reduced (it is better to leave more than half the amount) Package include: 1 x 4000w 220V SCR voltage regulator dimmerNote: As the model and display effect of the monitor may be different, there may be slight color difference, and the size is measured manually, there may be 1-2cm error, please understand.