Golf Cart 36 Volt LED Battery State of Charge Indicator 3-COLOR LED BAR GRAPH INDICATOR LIGHTS GREEN 40-100% YELLOW 21-40% RED BELOW 20% CHARGE EASY MOUNT AND CONNECT RUGGED BUILD QUALITY - SUPERIOR TECHNICAL SUPPORT NOTE: If you have a new hot acid battery type by Exide, Trojan, etc, you need to purchase the PRO36FRC- R I have listed.THIS WILL NOT work on hot acid batteries.