3-Step+ charge method optimum efficiency, meaning your batteries will perform better and last much longer. Designed for versatility, it charges virtually any combination of three batteries in a fast and safe way and works anywhere in the world. The ChargeMaster Plus handles worldwide AC voltages and frequencies. Resisting large voltage fluctuations and high temperatures, it keeps working in harsh environments.Multicharger with two outputs, one in/output, DC-DC converter, current limiter and VSRCombine Lithium Ion, Gel or AGM, and large or small battery banks on a single chargerCharges multiple batteries while underwayExtended specifications: offers 20% more output at 14.4V and 80% charging power at 140°FSafe Charge: quickly recognize the State of Charge for extended battery lifeVery wide operating range of 80-275V AC, 35-70 HzCompact, easy to connect and quick to install