GENUINE MS-5 POWER PET DOOR COLLAR. From the Makers of Your Power Pet Door. Engineered specifically for reliable Power Pet door activation. Door performance warranty only applies when used with genuine MS-5 collars, and door performance and pet safety is only guaranteed with collars made by High Tech Pet. POWERFUL SIGNAL: Produces the Strongest Signal of any Ultrasonic Collar with High Tech Pet's Patented Directional Ultrasound. This Collar Transmitts Your Pet's Direction of Motion to Reduce False Door Openings. DIRECTIONAL OUTPUT: Provides the Specific Coded Ultrasonic Signal Required by the Power Pet Door's Advanced Circuitry to Detect the Direction of Your Pet’s Motion, Reducing or Eliminating False Openings. PROVIDES 4-WAY PET ACCESS CONTROL: High Tech Pet's Unique Coded Ultrasound works with the Power Pet door to Enable our Proprietary 4 Way Access System. Choose Enter Only, Exit Only, Enter and Exit or Closed and Locked. This Genuine Collar is Specifically Engineered to work with the Power Pet door’s 4 Way System. Power Pet Door Every Time SILENT OPERATION: Genuine MS-5 Circuity Produces a Clean 40kHz Signal that Cannot be Heard by You or Your Pet. WATERPROOF: Tested and Certified to be Waterproof to 1 Meter Depth. Your Pet Can Swim, Play in the Rain and Snow without Fear of Damaging the Collar. QUALITY NYLON STRAP: Comes with the Classic Ultra Thin Strap Designed for Maxium Pet Comfort for Use by All Pets from Kittens to St. Barnards. ENGINEERING, PERFORMANCE & QUALITY YOU CAN TRUST: Manufactured by High Tech Pet. We've been making ultrasonic collars and Automatic Pet doors for over 40 years. We are the Leading, Trusted Brand. GREAT CUSTOMER SUPPORT: This Product is Backed by our US Based Customer Support Team. You Get Full Support On Demand by Our Highly Trained and Friendly Customer Care Specalists. We Are Here for You When You Need Us. Genuine High Tech Brand from the Makers of Your Power Pet door. The one and only MS-5 ultrasonic collar is a premium quality unit that operates all High Tech Pet Power Pet electronic pet doors. Using all digital circuitry, this provides the true digitally coded signal your Power Pet door needs to open reliability every time. Includes a specially designed B3V1A battery which lasts 3 – 4 months and prevents damage to the circuitry if the battery is accidentally installed incorrectly. the MS-5 is waterproof and rugged. It's perfect for the pet who likes to do some serious "ruff housing". The MS-5 is fully immersible to a depth of 3 meters 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. Small and lightweight, one size fits all dogs and cats. Comes with an attractive and tough 27 inch nylon strap and Includes 2 FREE Batteries!