This is a set of 25 LED Lights designed principley for outdoor use are fitted to a battery operated timer box. The box requires 3 x AAA Batteries that are not included. The timer unit is safe to use indoors or outside. The clear white LED bulbs are able to be set to turn off and on after a set time with ease and they can also be set to run in any one of the set of 8 mode sequences pre-programmed into the unit so you can choose your favourite pattern. A fantastic xmas decoration that will look great in your home or office.