
It is rechargable and will give you about 2 hours of typing time. It will also form the ends of your fingers into mushroom caps from beating on your desk for 2 hours straight. It does shut off the second you pick it up off the table. This is a built in feature so you (being the uninformed user) don't burn your retina out trying to figure out how it works.

This is a neat device though. It rolls up on itself and stores neatly in a little carrying case. M&M states that it will get 15 hours of use (which blows away the competition) but it is wired. This is not a big deal as it sits right next to the Blackberry anyway. I must note that this keyboard will only work with USB Blackberry devices (6000 and 7000 devices). If you have a BES you must also allow permission to attach the keyboard to the Blackberry and only works on BES 4.0 or higher.
Installing it is a pain. Once installed, you must invoke the program for your BB first or else the keyboard thinks you are charging it with the BB instead of wanting to key with it. I wish it would just recognize it. Not the case. Once you get past this it works good. The keys are little less responsive then on the I.Tech but on the good side, your fingers won't swell to the point you can't get your wedding ring off.

This device is the easiest to install and responds pretty well to keystrokes. It runs the same price as the Coolmir at $99.99. It is compact, folds over and fits into its own little case.
This has been the best device, to this point, for the price and I would recommend it to anyone whose thumbs are starting to grow from all the BB keying they are prone too.