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Usage method Voltage controller and desk lamp, electrical appliances are connected in series in the circuit (namely, disconnect any one of the neutral wire or live wire of the desk lamp, electrical appliances, pick up on the voltage controller terminal ), turn the knob cap, can adjust the light, speed, temperature,voltage regulating; simple and convenient operation. Specifications: Input Voltage: AC 220V Output Voltage: AC 0-220V Maximum Power: 4000W(Note that this is short-time limiting power ) Size: 100×85×53mm/ 3.94×3.35×2.09 inches Plug: US plug Weight: 450g Package Includes: 1×Variable Voltage Controller Note: 1, Voltage can be adjusted only under load conditions. 2, For this electronic product, please care don't touch the water when you use it, or the circuit will be damaged and has a shorter service life.