Hello @linden,
There is another option to power the MAX Transit using a 5 Volt USB supply, on the router under the green multi-function connection is two USB sockets. For the Max Transit to work best you need to power both, these each require 2A (well that is what it has written on it), though I have powered up our MAX Transit DUO that we have here with a single 5V USB standard USB2 connection successfully from my laptop (not the high powered port, just the standard port).
The power options are very diverse with the MAX Transit as touched on by @TK_Liew & @Antony_Chong
We like the unit as you can have dual power supply options on the router, this gives you enterprise power redundancy options for critical installations, have a look at this post, we really like these here in Australia
Happy to Help,
Marcus 