One important piece of information about the older Pocketalker Ultra, is that the headphone output is mono. if you attach stereo headphones to the older models, sounds only make it to one ear. You have to use a stereo to mono adapter with stereo headphones for the sound to make it to both ears. Of course, you can still find mono headphones so that an adapter is not needed. People think there is a problem with the Pocketalker when they plug in stereo headphones after replacing the original mono headphones that came with the unit.
Another important difference between the old and new Pocketalker is that the old model did not pick up a loop signal whereas the new model will pick up a loop signal.
Tony in Michigan