I used it once since I got it.
It is NEW

MULTIPLE MODES: 30 Amp quick boost mode, 100 Amp engine start for cars, SUVs, and small trucks
DIGITAL DISPLAY: Easy to use controls, LED light indicators, buttons, and digital display
BUILT-IN TESTER: Battery and alternator tester provides charge level and helps diagnose electrical problems
AUTOMATIC: Automatically detects 6 or 12V batteries; Microprocessor-controlled to automatically adjust the amperage rate to charge and maintain
SAFE AND EASY TO USE: Reverse hook-up protection helps prevent damage to battery and charger; Float mode monitoring automatically maintains optimum battery charge