Review on 🐠 Woliver Aquarium Heater: Submersible Fish Tank Heater with Digital Temp Controller - Perfect for Saltwater, Freshwater, and Turtle Tanks by Mac Owen

Looks like a traditional heater. It heats up and stays stable. What annoys me, however, is that there is a sticker on the top of the heater next to where it connects to the cable that says it. This label is meant to stay (there are no instructions on how to remove it) and hide cables and other mechanical items inside the glass tube. I have another heater like this in another aquarium. The same area is covered with black plastic, no writing, no stickers. I don't believe what's in this sticker or the ink. I wouldn't use this on critters - in an aquarium with plants it's probably fine.