Utilizing simple knob controls the PL3740 is easy to use and intuitive. Simply set your desired function (Charge Power Supply Mode Engine Start) and your operational mode (charge duration or PS Mode goal voltage) and press START. It's that easy. Plus in charging function it features both an AUTO charge setting as well as the more traditional timed (manual-style) settings including 20 / 40 / 60 / 90 / 120 minute settings. LED indicators alert the operator to charging progress and the unit incorporates a range of safety features to make charging safe for the operator and the battery or vehicle being serviced.