Energy saving device. Myth or reality?

To be honest, after such information processing, the hand reached for the phone to place an order.
After all, the number of devices is limited! Suddenly I can't! Somewhere in the back of my mind, I heard the laughter of my TOE teacher. Thirst for freebies almost won over common sense. Moving away from euphoria, I began to analyze the noodles that my uncle had just hung on me from the TV screen: