POWERplus Lampbase Light Timer is a very handy device to help you save energy and money. Perfect for garages & garden sheds, or any areas where you may leave a light switched on, and not return to for some time, as the Lamp Base Timer will switch the light off after a set amount of time that you set Screw the light bulb timer into the lamp holder and select the time you want the light to stay on for before it switches off automatically (between 5 and 60 minutes). Then if you, or someone else forgets to switch off the light, the Lampbase timer will do it for you. Also you do not need to worry about being left in the dark as an audible alarm will sound a few minutes before the timer switches off automatically. You can then reset the time by simply switching the bulb off and on again. It is a very effective and easy way to save energy. The Lampbase Timer accepts an "ES" screw fitting light bulb and has a screw fitting base. An adaptor to fit bayonet cap light holders (common in the uk) is included Plug and play. Installed in only a few seconds.