Do I need a fridge/TV guard?

#1
What exactly does a fridge/TV guard do, and is it necessary? I have seen them several times, but I have ever given much thought to whether I need one. Will it make my fridge/TV use more or less electric power?

How does someone know that he/she needs a fridge/TV guard? And, what are the features of a good fridge/TV guard?
cron