key product features light switch uses measurements Safety Measures Zero noise and flicker-free dimming to provide the best performance for dimmable bulbs. With soft start function overload protection, over-current protection, and over-temperature protection Multiple Uses Dim the lights 0% - 100% to save energy and extend bulb life for your expensive lamps. Let your eyes gradually adapt to bright light or darkness, reduce eyestrain and protect your eyes from overly bright lights. Save money and make your home more comfortable Specifications Dimensions of the electrical switch: 8.5cm x 8.5cm (3.5 inch), with slim 1cm thickness, ensuring a sleek, non intrusive fitting. Includes : dimmer knob, nut, washer, fitting screws, dimmer module, security module & anti-burn panel, for straight-forward, easy to follow fittings.