7B, the rear exterior surface of the device housing 702 may include a second recess 724B and a third recess 724C configured to cover the heads of the fasteners fastened into the first and second open slots 802 and 804, when the device housing 702 is mounted onto the mounting plate 800. Each of the second and third recess 724B and 724C may have a respective depth substantially greater than the respective head height of the fasteners fastened into the first and second open slots 802 and 804. In some implementations, the mounting plate 800 includes a first fastener structure 806 located at a first end of the mounting plate 800, and the first fastener structure 806 is configured to mate with a second fastener structure 726 located at a corresponding end of the rear exterior surface of the device housing 702. The device housing 702 is mechanically fixed onto the mounting plate 800, when the first and second fastener structures are fastened to each other. In some implementations, the mounting plate 800 includes a third fastener structure 808 located at a second end of the mounting plate 800, and the third fastener structure 808 is configured to mate with a fourth fastener structure 728 located at a corresponding end of the rear exterior surface of the device housing 702. The device housing 702 is mechanically fixed onto the mounting plate 800, when the first and third fastener structures 806 and 808 are fastened to the second and fourth fastener structures 726 and 728, respectively. In a specific example, the third fastener structure 808 includes an extended holding structure, and the fourth fastener structure 728 of the device housing 702 includes a recess hole configured to receive the extended holding structure. The extended holding structure may be pulled out of the recess hole of the device housing 702 when the device housing 702 slides along a longitudinal direction 812A or a transversal direction 812B, but not when the device housing 702 is pulled by a separation force having a direction perpendicular to a front exterior surface of the device housing 702. Further, the first fastener structure 806 may include a snap fastener configured to lock onto the respective fastener structure 726 of the device housing 702. Once locked onto each other, the snap fastener 806 and the respective fastener structure 726 securely hold the device housing 702 onto the mounting plate 800, thereby onto the wall or doorframe surface to which the mounting plate 800 is mounted. Alternatively, in another example, each of the first and third fastener structures 806 and 808 includes a respective snap fastener configured to lock onto the respective fastener structure 726 or 728.

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Police departments around the country are partnering with the doorbell camera company Ring in an effort to fight crime and create a sort of modern day neighborhood watch.

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At 15 feet, the alarm activated at 28 seconds.

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