This is a very nice power box. I really like the small increments that you can increase the power. It's everything I expected. In high power mode, it's got enough to make me scream, even without the optional mains power adapter. No major complaints at all. Only minor issues I have is that the "A" power adjustment knob appears to have been pushed onto the box a little too hard, so it rubs on the face of the box, but it works just fine. Also, when the batteries get low, it seems like the "A" and "B" power levels appear to be linked. At higher levels, if you decrease one, the other one increases. Not sure why? All in all, it does the trick... Oh, and my wife liked her first experience with E-Stim, too, thanks to the 2B ]:)
