[Door Compatibility] This doorbell mount is designed exclusively for inward-opening doors. It is not suitable for outward-opening doors, iron security doors, storm doors, screen doors, or glass doors. Ensure your door's thickness is between 0.59 to 2.36 inches and that there is a gap over 0.06 inches. Please measure your door prior to purchase. [Applicable Doorbell Model] This no-drill mount fits video doorbells with dimensions not exceeding 2.55 inches (W) x 5.11 inches (H) x 1.14 inches (D). [Easy Installation] Installing your video doorbell is straightforward. Simply place it into the anti-theft shell of the mount, secure it with sponge pads, attach the metal holder using screws, and adjust the fixed clip for a stable setup. No drilling is required, making installation simple and hassle-free. [Anti-Theft Security] Our mount features a hidden security screw on the back of the anti-theft case, providing true protection against theft. The design ensures the doorbell cannot be removed from the side of your door unless the door is open. Additionally, the front opening allows full access to the doorbell's motion detection sensor. [Durable Material] Constructed from robust metal and hard ABS shell, this mount is built to withstand attempts at theft while protecting your valuable video doorbell. [Practical Applications] Ideal for various settings including residential homes, rental properties, apartments, dorms, offices, and commercial buildings, this mount ensures your video doorbell remains secure and operational in any environment. Choose this reliable doorbell mount for peace of mind and enhanced security for your home or business.