The Orion-Tr Smart DC-DC Charger is a professional DC to DC charger with a 3-stage adjustment and built-in Bluetooth. It is used in dual battery systems in vehicles or boats, where the alternator and starting battery are used to charge the service battery. The unit can be monitored and programmed via Bluetooth and can be controlled remotely via an on/off switch. The Orion Tr-Smart charger can be used in 12V or 24V systems and is suitable for both lead-acid and lithium batteries. Available models up to 400W and multiple units can be connected in parallel for increased output power.