Hello! This is a wonderful little device that can only be used once a year. Together with a Windows PC you can use it to update firmware and configure Victron VE.Bus devices. Multi-hybrid inverter/chargers are an example of what they work with. Firmware updates are now part of everyday life for most devices. It made it into the world of power. Configuration on high-end devices has become quite complex, so you might be able to do what you need with DIP switches. The more exotic your application, the more likely you will need it for customization. In terms of operation, it is no more difficult than most similar devices. It's not as simple as an app on your phone connecting via Bluetooth. The target group are professional installers, not end users. If you're paying someone else to install your system, it probably won't be on your shopping list. If you have friends with Victron gear, borrow them and/or let them upgrade your gizmo. Another use for it is to run wires from "back there" to "everything here". After all the tugging and pulling, there's always the question "we broke something". Running this while the other end is connected to your device is a quick way to make sure everything is ok. There are other ways to test the cable. I wouldn't buy one just for that. When he sits there. use it. Worth the money if you have a device that needs it. Bean
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