This is a set of 100 LED Lights that 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 LED bulbs are able to be set to turn off and on at 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 Christmas decoration that will look great in your Home, Office or Garden