This professional DC-DC charger is designed for dual-battery systems in vehicles or boats where the alternator and the start battery are used to charge the service battery. A configurable 3-stage charge algorithm provides an adaptive bulk, absorption, or float modes to keep your 12V lead-acid or Lithium service battery in top condition. Alternatively, a fixed voltage can be chosen. Features include engine running and shutdown detection, remote on/off switch capability for manual or BMS control, and Bluetooth technology to monitor charging status in real-time, view historical data, or program via a Bluetooth enabled Smartphone, tablet or laptop.