Play it safe! They look like real candles, they flicker like real candles, but they are so much easier and safer! No heat, no melted wax to clean up. These are perfect for use outside because the "flame" won't blow out. These battery operated LED flickering tealight candles can be used anywhere you would use a regular tealight, and some places you wouldn't. The batteries are included, but they can be replaced when the time finally comes (3V, CR2032.) On/off switch. Each measures 1.5" diameter.