OptiMATE 2 Global, TM-421, 4-step 12V 0.8A Battery charger-maintainer MAINTAIN BATTERY - OptiMATE 2 connect & forget automatic charger-maintainer that optimizes the performance of modern hybrid cars & vehicles with 12V Eco Start/Stop batteries. SAVE POWER - Advanced 12V battery maintenance. Low Volt Save (from 2V); CHARGING AMPS: 0.8A (constant current). MODEL -TM-421 IDEAL FOR: STD, AGM, EFB & GEL 12V batteries from 3  96Ah. Weatherproof battery lead & standard battery clip set included. USE - Indoor / Outdoor (lowest temperature: -4F / -20C); STYLE: Weatherproof case with wall mounts, with 6ft / 180cm AC supply lead and 6ft / 180cm charge lead ending in SAE connector. INPUT - Global (100-240V 50-60Hz), high (CEC listed), fully sealed.