I have one and plan on testing for bit-accuracy this weekend.
I have yet to use it in the field, but it is a 9v device so it can be run by a 9-volt battery (I have no idea how long though). I am going to modify my UA5 battery pack (9.6v) this weekend and give it a ODL plug too, that way 1 battery pack can power both devices...
I'll get back to you monday or so with results and more info...
Terry Watts