Flexwatt is just a thin strip that you plug in and it heats up put it under the tubs on one side to create a hot side supposed to be around 92-90 and then the other side will be cooler so your snake can balance his body heat. doesnt give you a very good idea so just look at this https://www.reptilebasics.com/4-Flex...e-p-16248.html thats a piece of flexwatt