The 4-Paws EcoDryer is a easy to use dryer that uses your home's heating vent (register) to dry boots, gloves, shoes and other clothing and accessories. The 4-Paws Dryer has no moving parts and does not require batteries to use. The 4-Paws Dryer uses forced air from your furnace to blow warm air up 4 tubes built into the 4-Paws dryer, which quickly dries your stuff . When your heater turns on, it will efficiently push the warm air through the 4 vent stacks and what ever is on them. It's that simple!