120/277 volt input Completely self contained Self-connecting AC power plug 6 volt 5.4 watt high intensity wedge base lamps supply abundant amounts of emergency lighting Maintenance-free 6 volt lead calcium battery Low voltage battery disconnect-prevents deep discharge damage Brownout protection AC lockout Instantaneous transfer LED charge indicator light Flush-mount style test switch Injection molded, high impact thermoplastic housing Reverse polarity protection ETL Lis