This low-voltage dimmer switch features a nightlight and small slider to control the dimming function. It has R.F.I. suppression with power-failure memory and is easy to install. This is a three-way dimmer designed to control the line side of electronic low-voltage transformers powering incandescent lighting loads of up to 300 watts, where the lighting is controlled from more than one location, such as a hallway, or the top and bottom of a stairway (use 3- or 4-way mechanical switches at remote locations, not included). The preset feature maintains a light output preference. A neutral wire connection is required, and the designer-style wallplate is not included.