I have now purchased 2 of these wraps because they work so well!I brew kombucha and needed a heating wrap since our house gets chilly overnight during the winter months.This is truly a ‘set it and forget it’ solution! To enjoy the success I have with my kombucha simply read the directions that are on box the wrap comes in and you’ll be on your way to easy maintenance and delicious brews.There are 3 settings: High, Medium, Low. The info on the box outlines how to determine which setting to use, and when.When the wrap is used with a 1 gallon round glass jug it leaves a space to view a temperature strip if you use them, which I do. Many products of this type wrap completely around the vessel which makes it more difficult to check the temperature when necessary.The dimensions of it provide even heating for the vessel size I mentioned above. This is a big consideration when fermenting since you don’t want all the heat in one spot.It’s definitely a well thought out design and is a great value for the money since it will help make F1 a success each and every time!