Pivoting design for simple installation in any application, including wall, ceiling, sloped ceiling or recessed mounting; Suitable for installation in existing drywall applications; S900U option includes both single- and double-face panel configurations; Includes surface mounting canopy as well as bracket for recessed mounting applications; Compact, low-profile snap-in design for ease of maintenance; UL 924 Listed 90 minute emergency run time, 24 hour recharge time; Low voltage disconnect eliminates deep discharge; Suitable for Damp Locations