security alarms for homes
3. The device housing 702 further includes a front cover plate 708 having an button opening 710. A waterproof button assembly 1102 is formed in the button opening 710 on the front cover plate 708 of the device housing 702, and a button top 706 of the button assembly 1102 is exposed from the button opening 710. The front cover plate 708 of the device housing 702 may be made of a single piece of material e. g. , glass and plastic having the button opening 710, or a stack of material pieces e.