The Powermaster Dimmer Switch 1G 1Way is a single-gang switch designed to fit in a standard single-gang electrical box. It is a one-way switch, meaning it can be used to control a single light fixture from a single location. This dimmer switch is suitable for controlling the brightness of a variety of light fixtures, including table lamps, chandeliers, and ceiling fixtures. It is rated for a maximum load of 400 watts, making it a suitable choice for bulbs or fixtures with a combined wattage of up to 400 watts.