
I bought these for camping trips. They work great for keeping up with your drink in dark or dark environments. They work great in glasses with stems and thick bottoms that won't fog up. I tried it on blue glass and it barely showed up. I recommend transparent glasses. The glue is from 3M and works very well. I was able to remove it and stick it on another glass with no problem. If you plan on using them over and over again, I'd suggest taking a two-pronged approach. They are very easy to use. You need to pull the battery's transparent tab (but slowly, or the battery may come out). You then separate the backing from the adhesive and stick it where you want it. We've also used them on the bottoms of alcohol bottles. It helped you see how much you're watering. It has different flashing and lighting modes. It stays on, flashes quickly, and flashes slowly. At the bottom is a button to switch modes and turn off. It's also great for birthday parties! I think the price is absolutely reasonable for the price. I will buy these again! Even men love them.

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