Kit Contains: ...2 LEDs with 8-inch wires, ...A coin cell holder with pre-attached mini-switch circuit board ...1 CR2450 coin size 3-volt battery ...2 1-inch pieces of "EZ-shrink" shrink-tube You have the option to add more lights, this kit can run up to 10 lights nice and bright. Additional LEDs can be ordered separately 10 LEDs will run about 25 hours on one battery.