Motor speed controller operating voltage range is AC 110V to 220V, max is 4000W, long term operating is 3000W. High Quality: the high motor control module adopts double insulation, meaning there will be no electric leakage if short-circuit or burn out. Protection: our motor regulator is designed with Anti-spike and anti-surge protection, RC absorption, fuse all enhance usage safety. Aluminum Case: the motor speed controller is equipped with Aluminum case prevents it from easy damagement; filled tin stops it from heating when in huge current. Application: the motor governor can be applied to electric stove, water heater heat regulation, dimming lamp, small motor speed control, electric iron thermostat, etc. Parameters: Working voltage: AC 110V to 220V model:BTA41600B Maximum :4000W (connected resistive load) Long term operating : 3000W Voltage regulation: begin from 10V Adjusting voltage:10-220V Protection:anti-spike, surge, RC absorption (EOC) Note: The load must be connected before it is adjusted. For the first time, turn the potentiometer counterclockwise to the bottom before powering on. Otherwise, it is easy to burn out when it is energized, while it is connected to a load such as a small electric wire. is mainly used to resist positive load (electric wire incandescent lamp, etc.), most single-phase AC motors can also be used, please confirm the other types of load before buying. How to use: Connect output of the adjustable supply board with lamp, home appliance, electric circuit and its input to 220V AC, then rotate the knob for dimming, speed, voltage, temperature control. colour:blue + silver Material:metal size:85x55x38mm Package Contents: 1 x Motor Speed Controller Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.