Instant hot cold switching capability.Internal coil heats and cools for extended hot or cold therapy eliminating the need for heat or ice packs.Gets cold fast reaches 48 f in less than 2 minutes traditional chemical ice packs can take hours.Gets hot fast reaches 130 f in less than 2 minutes.Two level vibrating massage settings.Rotating massage head for hard to reach areas like the back and shoulders.Two sided massaging capability.Extra length handle.6 massaging attachments. Instant hot cold switching capability. Gets cold fast. Gets hot fast. Two level vibrating massage settings. Rotating massage heads. Two sided massaging capability.