The Panther battery gauge allows you to determine the exact amount of charge remaining in your batteries. Designed for panel mounting, the battery gauge allows you to monitor two batteries with the simple touch of a switch, and will work with any standard or deep cycle 12 volt lead acid batteries. The battery gauge's high-precision, rugged design will provide accurate battery charge readings in even the toughest conditions. The gauge is internally lit for day or night use. Comes complete with easy to follow instructions for do-it-yourself installations.