The Voltage Indicator is designed to test battery voltage to determine charge level. Utilizing LED indicator lights, it's easy to distinguish between Green (Charged), Yellow (Low Charge), and Red (Discharged). EASY TO USE Track your battery’s voltage condition with this tester which connects to vehicle ring terminals. A simple press of a button displays current battery voltage SIMPLE RESULTS This battery tester monitors battery voltage and displays the voltage on the LCD screen LED INDICATOR LIGHTS Indicator will be green if voltage is greater than 12 volts, yellow if the voltage is between 11.6 and 12 volts, and red below 11.6 volts LCD DISPLAY Display screen indicates voltage from 3 to 16 volts, with a resolution of +/-0.1 volt California Residents WARNING: Cancer and Reproductive Harm - P65Warnings.ca.gov