[Anti-theft Design] - The doorbell anti-theft mount is only compatible with Blink doorbells, which can securely enclose your video doorbell and cannot be removed from the door side unless the door is opened. Perfect for apartments, offices, multi-family homes, and dorms. (Blink doorbell not included) [No Tools or Installation Required] - Installs securely in seconds, easy to install and uninstall. Simply place the Blink video doorbell inside and slide it onto your front door, adjusting the mounting clamp to your door's thickness. [Applicable Doors] - Checking your door before ordering is the most important thing. The door must swing inward. The door thickness must be between 1.5cm and 5.8cm. The door gap size must be larger than 0.15cm to be usable. Iron anti-theft doors cannot be used. [High-Quality Materials] - The Blink doorbell mount is made of high-quality plastic shell and metal. It attaches securely, so your Blink doorbell won't fall off the door. All holes in the Blink doorbell cover are carefully designed and will not block the doorbell's motion sensor and two-way audio. Color: White Material: ABS+Metal Package Contents: 1 x Video Doorbell Mount Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.