Yes, it’s XLR connectors for RS style boats, although I have a SWAMP panel also connected to it … it works with any Serge you just need the right power cable.
One power supply runs 3 boats. I previously had the RS power supply, which has 5 connectors but is in reality nowhere near enough power for 5 boats, unless some of them are really light power draw.
The LW power supply is based on the Ebly one I believe, but Charlie makes his own ultra-portable enclosure for it that comes in many fun colours 
I have one grey and one orange running my 5 boats. I play live a lot, and tour, so I need power that is very portable. The RS power supply is heavy and huge, and really not that powerful. The Konstant one is also heavy and huge but a little more powerful I think.
Here is a pic of one of mine so you can get a sense of the size, but Charlie has much better pics online.