With a very strong adhesive backing for attachment to the aquarium wall. Unfortunately, that's where the battery is. So to change the battery you have to WAIT the thermometer out of your tank (literally with all your might), replace the battery and then figure out yourself how to put it back in since you just destroyed the sticky pad. During setup I set it to F (default C). However, every time I walked by the aquarium and looked at the temperature, it switched back to C. Yes, I kept turning them back to F. Eventually, he died a few months after taking over and facing this great inconvenience. . That's when I realized that the whole time I was walking by and looking at it, the battery must have been dead. This is one of those big dead batteries that you don't usually have on hand. So I ordered a few, removed the thermometer, let it run for about 30 minutes, scraped the remaining adhesive pad off the glass, changed the battery and guess what! Nothing! I don't know if I got lucky but damn I won't get a second one. It was a very terrifying, tiring and frustrating experience.
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