Review on Mylivell Submersible Thermostat Adjustable Temperature Fish & Aquatic Pets by Gloria Jones

I've been using it in my 20 gallon tank for almost 5 months and have no complaints. The temperature stays exactly what it is set to. I like that it's not bulky or huge like some stick-shaped heaters. I took off a star because it's in Celsius and I thought it was in Fahrenheit given the product description and there's no way to change it. At first I thought it could be changed because both C° and F° are printed on the temperature controller. Unfortunately it wasn't like that. It's not a big deal but sometimes I give myself a little heart attack when I look at it and see "27" then I remember it's not Fahrenheit so my heart rate is back to normal and I breathe a sigh of relief. , uuuuu. :)