This is a cat door panel for sliding glass doors designed to prevent stray cats from entering. Suitable for average-sized cats. Only cats with the special magnetic key can enter from the outside, preventing stray cats from entering. The cat door is a Cat Mate 254. ★Only one available. First come, first served. ●Compatible with sliding glass door heights of 150cm to 230cm [Made in Japan] ●Adjust the height by inserting the upper panel into the main panel. ●Cat door opening: 14.5cm x 14.5cm *Please make sure your cat can fit through. ●Sensor door already installed. ●Includes 2 sensor magnetic keys. ●Requires a 9V square battery (sold separately). Please note that returns and cancellations are not accepted.