I've made these little LED lights for years as easy ways to add lighting to everything from cosplay to doll houses to holiday decorations. These lights are Yellow candle flicker 5mm LEDs connected to a small battery pack. Candle flicker bulbs imitate the flickering of a candle flame. Each order contains 4 complete lights with 1 battery installed and 14 extra CR2032 batteries. You can operate lights with a single battery, too. The battery pack measures approximately 2 1/4" x 1 1/4" x 1/4" and has an on / off switch. Wires usually extend about 5 1/2 to 6". The battery holder uses 2 batteries, but on yellow lights, two batteries make the light a bit orange. It's possible to operate them at a lower voltage, using one battery, which makes the light more yellow, by bending the copper contacts so they touch when the holder is closed. I ship all the batteries, but I only install one in each. I have smaller 3mm bulbs as well as several other colors of candle flicker bulbs, including white, yellow, orange, red, blue, and green, as well as color-changing slow RGB (red, green, and blue) and fast RGB. Contact me about mixing colors or sizes of bulbs before ordering if you would like to make substitutions. Lights are made to order, so I can accommodate many requests. Battery brands may vary, but I always use fresh, carded batteries. Please note. small batteries may pose a choking hazard, so keep them away from small children. #craftlights #DIYlights #ledlights