FeaturesDie-cast aluminum housingLED lampingUniversal pattern knockouts on rear of housing for direct mountingKnockout chevrons for quick conversion to signsField selected red and green sign capability standard on all units (units shipped red, field convert to green with supplied parts)EZ Key patented external battery disconnect feature prevents unnecessary battery drainage, saves on installation timeSolid state voltage limited chargerBrownout circuitLow voltage disconnectTest switch/power indicator lightStandard 24 hr recharge timeRed and green letters