UL and CULus listed ,0 to 40 indoor damp location listed
Injection-molded thermoplastic ABS housing, UL 94V-0flame rating.
Built-in 9.6V600mAh Nickel cadmium battery for minimum 90 minutes emergency operation.
Letters 6" height with 3/4" stroke. Optional RED or GREEN letters,with Back -up Letter Cover
Maximum 24 hours for full recharge time;Five years warranty for the electrical parts and housing,three years warranty for battery.