DavecUK its the same sort of hand held battery air pump that I have packed in the case alongside the Portapresso. The kickstarter Xbar machine also has a 58mm basket and uses the same type of battery pump device. Max pressure is 150psi which is pretty darned good. They recharge via a USB cable.
Regarding getting the temperature up to say 90 degrees, if the device allows the removal of the group head, like the flair, I simply place it in the kettle, get it to boiling and fish it out with a pair of tongs. I have a heat strip on the outside. Its a wee bit dodgy in terms of accuracy and its certainly not stable but it mostly does the trick. And some places I go, it can be very challenging to find an espresso that I like. With my espresso travel kit, I’m gauranteed a quality fix for my addiction before I step out of the hotel in search of breakfast.