The BatteryMINDer 12/24 Volt battery temperature sensor can double the life of any type of 12V or 24V battery when used with Item#s 167988 or 167989 BatteryMINDer charger/maintainer/conditioners. Can double the life of any type of 12/24V battery when used with Item#s 167988 or 167989 Prevents over/under charging batteries Senses battery temperature and allows charger to automatically adjust output to ensure correct rate Works from 32°–125°F Delivers an extra 200+ full charge/discharge cycles from battery