I purchased these lights to use in painted glass bottles and to hang up on the wall near the kids beds, their was 6 sets altogether with battreys included in each set.
each set of lights worked no problem, theirs a compartment to change the battreys with on/off switch, the lights are really small but very bright and perfect for what I wanted.
they give of enough light next to the kids beds so that they can read before bed without the need to have the main light on .
included in the box is a mini screwdriver for when the batteries need replacing. But be careful it's so small it's easily misplaced or lost.