Die Hard, 12V, 2A, Slow Charger, 12A Fast Charge, 12A To 30A, Variable Rate Rapid, 100A, Engine Start, Microprocessor Controlled, Fully Automatic, 5 Stage Charging Process For Precise Charging & Monitoring Of Automotive, AGM, Gel Cell & Deep Cycle Batteries, Float Mode Monitoring Keeps Battery At Optimum Charge Level By Providing Just Enough Power To Keep The Battery At The Proper Voltage, Battery & Alternator Tester Helps Diagnose Electrical System Problems & Measures Battery Percentage, Easy To Use Touch Pad Controls Which A Touch Of A Finger, Select The Display Mode, Battery Type & Charge Rate, Digital Display & Status LEDs, 125A Clamps For Top & Side Mount Battery Posts, Reverse Hook Up Protection.