10 Warm White Fairy Light LED's on Silver Wire with Replaceable Batteries
20 Fairy Light LED's on long Copper Silver or Gold Wire with Replaceable Batteries
Button Batteries/ Coin Cells and Simple Circuits
AMX3d Jewel LP LED with Coin Cell Battery Holder - 5 Low Profile Jewel LEDs Compatible with Lilypad Arduino Projects - 5 LED Kit with 1 Battery Holder and Conductive Thread, Color Blue - Walmart.com