Construction; Precision molded unit and lamp housings constructed of UV-stable UL 5VA flame retardant, corrosion-resistant thermoplastic. nits resist denting, peeling, scratching and corrosion. Tool-less access provided for easy maintenance. White or black textured finish.; Electrical; Dual 120/277 voltage standard Rated for use in damp locations Solid state charging and switching Brownout protection Battery low voltage disconnect Overload and short circuit protection AC power indicator and test switch; Illumination; Two fully adjustable, recessed lamp heads allow for maximum light to be delivered to the path of egress. Fixtures are supplied with high-powered LED lamp optics that deliver up to 125 on center spacing (high-output TSR-HO Series) with up to 1100 total lumens output. The standard TSR unit delivers up to 70 on center spacing with 520 total lumens output. The LEDs have an estimated life over 50,000 hours with normal use.; LiFePO4 (Lithium Phosphate) Battery; LiFePO4 batteries are environmentally friendly as well as thermally and chemically stable which makes them one of the safest batteries to use. With an extremely low discharge rate and high-power density the unit is able to provide unsurpassed performance. A fully charged pack will disconnect from the charging circuit, drawing no power. This feature significantly reduces the amount of wasted power when multiplied by the number of units installed. The cells chemistry allows for environmentally friendly disposal making it one of the greenest energy sources available. LiFePO4 batteries perform optimally in temperatures ranging from 0 degreesC to 40 degreesC (32 degreesF to 104 degreesF).