does not stick to tank and does not tell you what the battery is for

I love this thing. I've been trying to find a good, reliable and sticky thermometer for my tanks. I have about 20 and am tired of the cheap ones failing out falling off, then out, of the tank. They also fail often, never last long, sometimes change tempature readings from f to c without me asking. Not to mention accuracy! It's awful. I care too much about my little fish friends, shrimp, plants and yes, snails lol... To play the "I hope the temp is close" game.
I wasn't sure I wanted to spend this much on a thermometer for every tank but recently I had new heaters in 3 tanks that failed. I ordered a few different thermometers to try, one failed immediately. This one is accurate, looks good, super easy to use!!!! Seriously! Under a minute to read the instructions then had my too high and too low temps set. I feel better just having that alarm option.
I'm definitely going to be getting these for all my tanks, a couple every month. It's worth it.

If I could change one thing it would be that this meter light up brightly when the alarm is going off... Finding out which tank is beeping will be amusing lol! I'm not the only multi tank hobbiest, it would help immensely!

I will update this, as I always do, the moment anything changes. I want my feedback to remain accurate since it's how I make a choice on products here (have you read the reviews on heaters?! Does anyone make a reliable aquarium heater? Good grief lol)

Great product. Pretty spot on accurate. Love that I can set a high and low temp. It flashes when the temperature is too low or too high. I did read other reviews before buying and I noticed a lot of people said that the battery that already comes in it dies pretty quick. And mine died after 1 week of use. So I already had to put the back up battery in so thankfully it came with a backup.

This aquarium thermometer is super sleek and well designed. It is adhered to the tank so once you pick your spot it should remain there. The sensor is quite accurate and works with both acrylic tanks like pictured and glass tanks like I've put my other one on. The 24 temp range being shown is very neat and will be useful for future breeding endeavors.

Cons:
-No directions included; had to Google them or read the Amazon description on how to use.
-Arrived sealed in box with a dead battery (and a replacement...which is weird in itself)
-Once on the tank, it is not coming off; adhesive it not like a Command strip but just two faced foam tape

Pros:
- Clean design
- Wireless, so no worry about the cables inside the tank
- Easy to read