Yes, it is wind and weatherproof with an airtight seal.
Yes, it comes with a complete installation guide and can be installed in doors, walls and even sliding glass doors.
The medium size typically fits pets up to 30 pounds. Please refer to the product specifications for detailed measurements.
No, it works with a MS-4 ultrasonic collar that your pet wears.
Yes, it has 4-way access control (In Only, Out Only, Full Access or Closed & Locked).