White Square Edged Plate, Suitable for domestic or commercial installations., 1 Gang 500W for 1 / 2 Way Circuits, Co-Ordinating White Control Knob, Overload Protection, Rotary On / Off with Rotary Dimming, Suitable for Mains / Low Voltage Lighting, Not Suitable for Wirewound Transformers & Fans, Back box depth 25mm.