Fitting the cordless Gutter solar lights is as easy as hanging up a jacket. Simply clip it over the edge of the gutter and the job is done. There's no drilling required, no wiring to worry about and no need for any tools at all. The solar powered gutter light has absolutely no running costs, it solar panel on top recharges its included batteries during the daylight hours. An automatic sensor turns it on at dusk and off at dawn, lighting its lifetime LED for up to 8 hours. Gutter solar lights feature three high intensity super bright LEDs, they're weather resistant for use over doorways, garages, paths, driveways, patios, balconies, in fact anywhere and everywhere you need the safety and security of bright outdoor lighting. The Solar gutter lights come with an on/off switch. Size: 11.5cm in diameter.