The Magnetic Collar allows only your pet to activate the cat door for easy and controlled access. Additional collars are available for multiple pet households and can be purchased separately.                                                                                                                              

Features:

• For cats up to 25 lbs.
• Flap size 7" x 9"
• Cutout size 7.375" x 11.75"
• Door thickness range 1.25" to 1.75"
• Transparent flap features 4-way operation.
• Interior or exterior use.