Ideal for charging any combination of up-to four 30-500mAh 1S UM and MCPX batteries as well as 2S battery packs equipped with the 3-wire JST-PH plug featured on UMX-class airplanes and helicopters. Its AC/DC capability means that you have the option to use a separate DC power supply or simply connect the charger to a household wall outlet. Built-in sockets make it easy to connect single-cell batteries. In addition UM battery leads are provided when preferred by the user. The rugged case features four independently functioning charge circuits each with a simple LED status display. All four ports have 9 watts of dedicated power and five selectable charge rates from 0.1-1.0A. Built-in protection features guard against short circuit over current and reverse polarity.