Operates all High Tech Pet Power Pet electronic pet doors as well as Sound Barrier and Yard Barrier sonic fences;Using all digital circuitry, this state of the art design provides a stronger signal and maintains better accuracy over all temperature ranges;With a fully enclosed ultrasonic speaker, the MS-5 is waterproof and rugged;Immiscible in water; stands up to heavy rain showers and is perfect for dogs who love to play in the snow;One size fits all dogs and cats; includes an attractive, tough 27 inch nylon strap