Slimline, ultra compact, low profile. Charge rate/power on LED indicator light and push-to test switch for mandated code compliance testing. LVD (low voltage disconnect) prevents battery from deep discharge. Long life, maintenance free, rechargeable NiCd battery. Internal solid-state transfer switch automatically connects the internal battery to LED board for minimum 90 minute emergency illumination. Fully automatic, solid state, two rate charger initiates battery charging to recharge battery in 24 hours. Universal surface mount, wall or ceiling, with EZ-snap thermoplastic mounting canopy. Ultra-bright, energy efficient, long-lasting red LED. Injection-molded, engineering-grade, V-0 flame retardant, high-impact, thermoplastic. Curved face, rounded corner design. 11-5/8" long x 7-3/16" high.