It’s the light switch you turn on and off just by blowing on it. The Magical Blow On/Off Light Switch also works if you flip up the switch with your hand like a normal switch (but why would you want to do that?) This light switch doesn’t screw into your wall like a regular switch, instead you plug a lamp or other appliance into it and prop it up wherever you want.
it basically lets you put a switch anywhere; so besides the novelty factor of a blow on light switch, it can also work as a sort of lamp switch extension cord. Put a switch next to your bed for a lamp that’s across the room. Cool stuff actually.