PediSmuter Professional Electric Callus Remover & Shaver | Instant Results - 100V-240V 24W - Each Really helps! by K. W Really helps! by K. W Product Comment: I've had calluses for years, and this is the first device that's actually helped smooth them off quickly. I like that it has an electric cord, because the devices with batteries run down too fast. The skin gets hot if I leave the grinder in the same place for too long, so I'm having to learn how to use the device safely. This was well worth the money. I'm very pleased!