The OptiMate 1 Duo Automatic Maintenance Charger is a cost effective 12V and Lithium Battery maintenance charger, providing you with more battery power for a longer battery life. Simply connect and forget.0.6A (constant current) charging AmpsIndoor use only - lowest temperature: -4°F / -20°CLow Volt Start of 4VSTD, AGM and GEL 12V batteries from 2 30Ah and Lithium (LiFePO4) 12.8/13.2V batteriesGlobal (100-240V 50-60Hz), high efficiency (CEC listed), fully sealed inputDust proof case with wall mounts, with 6ft / 180cmAC supply lead and 6ft/180cm charge lead ending in SAE connectorNo risk of overchargingTotally safe for vehicle electronicsSparks suppressedSafe for long-term battery maintenanceAutomatic shut-down if short-circuited or battery disconnected3-year limited replacement warrantyO1 weatherproof battery lead and O4 battery clamp lead includedThe OptiMate 1 Duo Automatic Maintenance Charger uses the latest charging technology to automatically determine the type of battery is it