pressing in the paddle shaped resilient arms 64 and pivoting the cover member 56 off of the back member 58 in other embodiments cover member 56 may be secured to back member 58 in any other suitable manner such as by tabs snap locks press fit structures or any other suitable mechanism in still other embodiments that do not require the housing 54 to be opened to mount and install emergency lighting device 10 cover member 56 may be non removable from the back member 58 housing 54 which includes cover member 56 and back member 58 may be formed in a variety of different sizes shapes and configurations to accommodate any necessary or desired components for example for embodiments using multiple batteries back member 58 may be formed with an increased depth to accommodate the batteries 60 fig2 shows a housing 54 with increased depth in the embodiment shown in fig3 an outer edge 68 of back member 58 substantially defines an oval shape and cover member 56 substantially defines at least a partial egg shape when assembled housing 54 fits over mounting member 12 to conceal most of member 12 fig5 shows in more detail a portion of the emergency lighting assembly 14 of the emergency lighting device.