This is the genuine ultrasonic pet door collar made by High Tech Pet, manufacturer of the Power Pet automatic pet door. It comes with included genuine B3V1A battery which lasts 2 – 4 months. Only the MS-5 collar emits the true digital signal your Power Pet door requires to open reliably every time. This special signal is directional to open your Power Pet door when your pet is on a direct approach and is less likely to open the door when your pet is just wandering by. The stronger signal also maintains better accuracy over all temperature ranges. It is water resistant and operates all High Tech Pet Power Pet electronic pet doors. The rugged design is perfect for the pet who likes to do some serious "ruff housing". The MS-5 collar is fully immersible for short periods and will continue to work when wet. It will stand up to heavy rain showers and is perfect for dogs who love to play in the snow. Comes with an attractive and tough 27 inch nylon strap. Put your cherished pet in the hands of the trusted High Tech Pet brand. Guaranteed to work correctly every time!