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The first and second open slots 802 and 804 can therefore define two perpendicular directions of adjustment for the position of the mounting plate 800, and each of these two perpendicular directions of adjustment is associated with a
respective range of adjustment defined according to a longitudinal size of the respective open slot. Further, in some implementations, the heads of the fasteners fastened into the first and second open slots 802 and 804 rises beyond the front surface of the mounting plate 800 by a head height. Referring to FIG. 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.
free security systems
Pipe networks can be constructed leading to ASDs that can easily be hidden. This works well in hotels and posh offices where smoke detectors may look aesthetically displeasing. The National Fire Protection Agency recommend that people install combination alarms, that is, a combination of photoelectric and ionization technology. However few alarms combine both kinds of detection. Combination alarms rarely carry a built in carbon dioxide detector. Combination alarms run on AA batteries and cost around US$23 each. Most photoelectric smoke detectors run on AC power circuits meaning the users have to install the wirings around the house. Such smoke detectors also have a backup
battery aside from the 120 volt power it needs to function. Smoke detectors should be placed where smoke isn’t supposed to be. Avoid installing them in kitchens or rooms that have steams like saunas and bathrooms to prevent
false alarms. Do not install smoke and carbon dioxide detector in breezy and ventilated areas like in front of electric fans, air conditioners, windows and doors.
security for the home
Prices exclude additional equipment charges, inside wiring fees, additional outlets, taxes, surcharges including video Broadcast Surcharge $10. 00/mo. and Regional Sports Surcharge $9. 00/mo. , depending on Cox
market and other fees. Not all services and features available everywhere. A credit check and/or deposit may be required. Offer not combinable
with other product offers. Online orders only. Other restrictions may apply. Homelife Automation Discount Note: Most promotional prices cannot be combined with promotional prices for other services.