Dog Door Sensor, Compatible with High Tech Pet Door, for MS-5/4

• PET‑ONLY ACCESS: Compatible with High Tech Pet automatic dog door, fits High Tech Pet collar MS‑5 & MS‑4. Only pets wearing this ultrasonic collar sensor can enter and exit
• 2-LEVEL SWITCHABLE SETTINGS: This dog collar sensor for electronic dog door features two selectable modes for 4-8 months of regular daily use under typical operating conditions
• ROBUST CONSTRUCTION: This collar sensor features an aluminum cover, even great for energetic, playful dogs and suited for rough‑and‑tumble daily wear
• COMPACT SIZE: Boasting a mere 3cm diameter, this sensor works well for small‑sized pets for a comfortable, low‑profile look on collars
• FITS VARIOUS COLLAR WIDTHS: This sensor does not come with a collar, but includes hook‑and‑loop strips for easy attachment to collars of different widths

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