OptiMate 1 DUO delivers precise micro processor controlled charging and long term maintenance. Maintain any type of 12 volt lead-acid battery without overcharging, filler cap / wet cell, sealed AGM (MF) or GEL and 12.8/13.2V lithium (LiFePO4) batteries. Ideal for vehicles that are seldom or seasonally used, or in storage. The OptiMate maintenance program delivers only what the battery nee, mail us for price or alternativeds, never overcharges, never undercharges. Cost-effective 12V battery maintenance CHARGING AMPS: 0.6A (constant current) USE: Indoor (lowest temperature: -4°F / -20°C). SAVE: Low Volt Start of 4V IDEAL FOR: STD, AGM & GEL 12V batteries from 2 - 30Ah & Lithium (LiFePO4) 12.8/13.2V batteries INPUT: Global (100-240V 50-60Hz), high efficiency (CEC listed), fully sealed. STYLE: Dust proof plug-in case, with 12ft / 370cm charge lead ending in SAE connector. SAFE: No risk of overcharging. Totally safe for vehicle electronics. Sparks suppressed. Safe for long-term battery maintenance. Automatic shut-down if short-circuited or battery disconnected. 3-year limited replacement warranty. INCLUDED: weatherproof battery lead & battery clip set included.