Review on 🐟 Efficient and Precise: Hoosel 100W Submersible Betta Fish Tank Heater with Adjustable LED Digital Display by Katrina Dorsey

You simply connect it to your aquarium and it slowly regulates the temperature to the desired value. It has an adjustment knob on the cord and a digital display on the heater itself that you can see as you set the temperature. It has a light sensor that lets you know when it's reached your desired temperature, and it works pretty quickly, all things considered. It's a decent size, not too big or too small, but has a medium-sized heater. worked well for what we needed it for.