Questions about Intertech Mini-ITX PSU NAS

According to the manufacturer's specifications, a 12V power supply unit is compatible with a maximum output of 200W. The connection for an external power supply unit is a round plug with the dimensions 5.5x2.5mm. Depending on what the system requires, different variations are possible here. Data sheet I could not find a suitable one in our range with the desired specifications, but with the data sheet and this information the search should be easier.

This 84 Watt power supply should fit: Akasa external power supply for Mini-ITX systems 12V - 84 Watt (80 W) If you need more power, you would have to switch to another model. According to the manufacturer, the DC socket has a dimension of 5.5mm x 2.5mm.