Seriously. Absolutely fricking ridiculously large. In a big way. But those guys that made it force you to buy and use it if you want to run off of DC. I won't go much further, but this one of the reasons I am inching towards describing my emotions toward this manufacturer as disgust, disdain, or discotheque.
But I got it because I saw the light and moved on to Respironics equipment a couple years back, leaving me with an S9 that is sitting unused. And so, in order to make it compatible with the battery backup setup I gots, I need it to run on DC power (preferrably 12 V DC power like virtually every sane manufacturer uses), but the S-9 don't. So the only way to get this thing to work is to use their darned shoe box-sized converter (well, they would have to be small shoes, but shoe box size nonetheless). I need to roughly get my units synced up WRT total blower time and then swap them out every month or two.
Soooooo. I sit here having disassembled the cigar lighter converter and I am about to cut it off the end of the cord so as to install a proper Anderson PowerPole connector so it will hook into my equipment.
So, unless I at some time need to upgrade to an ASV or BiPAP at some point, I should be set for machines for likely the rest of my life... Or maybe I'm a hoarder.
I don't know if that's a good thing or not.
Gosh, did I mention how big and heavy this thing is? I cannot imagine how anyone would want to schlep this along with the unit as a travel machine. It probably outweighs my S-8 traveler. Well, maybe not. It tips the scales at 25 oz buck nekkid. And I plugged it into one of my backup batteries and it fired right back up like it didn't miss a night since I took it out of rotation 2-3 years ago in favor of the PR SystemONE.
OMMOHY
Gratuitous graphic below: