An Elkay single contact time delay switch that has been designed for use with standard square back boxes measuring a minimum of 16mm in depth. When being used with metal back boxes it is required to file any remaining mounting lugs to prevent damage / short circuit of the unit when in use. It can be used with a multitude of different types of lighting such as LED (3A) Incandescent (6A 0 -240V) and Fluorescent / Compact Fluorescent (3A 6 fittings maximum). To operate this unit simply press the plunger in to make or break the circuit. Over the course of the timer the plunger will return to its normal state (please note that there may be a flash when pressing the plunger this is normal). To adjust the timer there is a timing screw mounted at the back of the product. Turn the screw clockwise to increase the delay and anti-clockwise to decrease the delay it can be adjusted through a range of 5 seconds up to 5 minutes (300 seconds).