Designed to switch on when lids are raised or doors are opened, just like your fridge light, but for anywhere in the home, or for when out & about on camping adventures. The cooler light comes with 3 x LR44 batteries already installed, & they are easily replaceable. These are great for putting in dark cupboards, drawers, inside boxes used for crafts, fishing, tool boxes, or its intended use, for an ice box or cooler, so great for camping, glamping, & festivals. Simply remove the backing & stick, the batteries can still be changed when the light is stuck down. 3 x LR44 batteries included + replaceable Automatically lights when door open or lid lifted 8.5cm x 6cm x 1.5cm