The Floralyte II is a bright LED light designed to be used multiple times. Use it to illuminate floral arrangements, props, centerpieces, serving trays, candles, ice sculptures, place settings and more. These lights are wireless and battery operated. Once activated, they have a battery life of 36+ hours, and the batteries are not replaceable. These lights come in packs of 10, and measure 1.5” long and .25” deep. Each light has an on/off switch, and a loop for fastening. You can put them in water and they will still work but the dye from the casing will start to leak. This will not ruin the glass vase.These are powered by non replaceable batteries. Attached to each Floralyte is an elastic string that can be used for hanging the light, or it can be removed. .