Products with battery backup contain a battery so in the case of a power outage the lights or signs with stay illuminated for roughly 90 minutes.
Damp Location
These items can be placed where they may be splashed with water. Typically they are safe to be used outdoors.
NEMA Rated
NEMA Rated enclosures are intended for indoor or outdoor use primarily to provide a degree of protection against the entry of water during prolonged submersion at a limited depth. NEMA 12 NEMA 12 enclosures are designed to prevent the ingress of dust, water, and oil.
High Lumen
A lumen is a measure of the amount of brightness of a lightbulb -- the higher the number of lumens, the brighter the lightbulb. High Lumen Emergency Lights are much brighter than the standard emergency light.
