Yes the CHPro Throttle USB is stand alone.
With the CH software it can be combined with other CH USB componenets to make a single unit.
I am extremely pleased with CH Products and their service!
I've been very generously treated by CH Products! Yes the CH stuff cost you but so far I've been treated respectfully and with consideration. Even got repairs for $6.00 S&H after the warrenty ran out! The guy listed below even called me at home re my problem! Tested the equipment himself before returning it too!
I have a CH Pro Throttle USB, a CH F16 Fighterstick analog, and CH pedals analog. CH says analog and USB don't work together but they're workin great for me and I believe for several others that are in this sim. When my budget allows I'm going all CHPro USB.
I recommend CH Products to anyone! IMHO they're the best!
http://www.ch-hangar.com/forum/index.php?Want to really be sure??? ask this guy at the above site MichaelCHProd
And this thread
http://www.ch-hangar.com/forum/index.php?showtopic=1605