Remote on-off connector on the high power models.
The remote on-off eliminates the need for a high current switch in the input wiring.
The remote on-off can be operated with a low power switch or by the engine run/stop switch.
All models with adjustable output can also be used as a battery charger.
For example to charge a 12 Volt starter or accessory battery in an otherwise 24 Volt system.
All models with adjustable output can be paralleled to increase output current.
Up to five units can be connected in parallel.