PRO12-48R Battery Indicator For 12, 24 & 48 Volt Systems Auto Ranging Battery Monitor - Connect to any fully charged lead acid battery system and the meter will select the proper range, for 12, 24 or 48 Volt DC systems. Works on lead acid batteries as the meter can be set for one of two discharge curves found from different battery manufacturers. Exide, Trojan, Continental and Interstate batteries will NOT work on the standard meters found on the market today. The PRO12-48R resolves this issue as it can be wired to work on these newer type batteries or the standard lead acid battery. Normally closed relay output operation for controlling secondary devices, 5 volt logic- limited to 200 ma. Relay opens or closes (depending on how you wire it) when the display shows fully discharged - flashing red #1 and yellow #2 LEDs Can be used on forklifts, golf carts, solar sytems and any other battery powered equipment