This Energi-Lite emergency lighting features a miniature LED battery unit and fully adjustable glare-free lens with a long service life. It also features an injection-molded thermoplastic ABS housing. It has a dual voltage input capability 120/277V AC. Low voltage disconnect prevents overdischarge of the battery while battery lock-out prevents discharge during installation. The sealed and maintenance-free 3.6V battery offers 90 minutes of emergency lighting autonomy. The battery is equipped with an automatic, temperature compensated, pulse type charger. Momentary test switch allows for quick operational check. Rear keyhole slots and universal knock-outs make it easy to mount the product to any standard 4" junction box. Installation is fast and easy thanks to its snap-together design.