Multicolor LED Coasters For Illuminating Drinks & Bottles-Set Of 4 (W/Batteries)

These are neat lil LED light up coasters that can really be used to illuminate anything glass that's somewhat clear. Some reviews said they use them to make their bongs glow, but I'm sure there could be 100s of uses for these compact lil battery operated discs. I just thought they were cool & I picked up a set for my home & one to list, but I haven't decided what I want to use them for. I dont drink, but they could be used for non alcoholic beverages too, ik.lol. I think they'd be really awesome under a vase of flowers, but I haven't gone & gotten any flowers yet. lol. They seem simple enough. There is a button in the middle clearly labeled on/off, I do believe they're self-explanatory for the most part.lol.I figured I'd list a set incase anyone has a creative use for these or wants to light up their drinks or bongs.lol.They did say that the clearer the glass, the better the effect. They don't light up as bright with darker glass & they have a sticker backing over adhesive so they can be stuck to something. The bottom of a drink, bottle, bong, vase.🤷‍♀️ The size measurements are in the photos & they require LR/AG/SR batteries, but they come with them already in each coaster. This listing is for a set of 4.(If anyone has any cool ideas for the possible uses of these, please drop it in a comment below?--Thanks!)