All New PCB board design. Kit Contains: ...2 LEDs with 8-inch wires to play with...1 coin cell holder with pre-attached mini-switch circuit board ...1 CR2032 coin size 3-volt battery. 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 9 hours on one battery.