It's a Rife/Bare type device with a Progen frequency generator that has less range and harder to program than a Atelier Robin. They didn't use an Atelier Robin because of an interference problem that may have been resolved in newer models.
The Perl is suppose to have all the bugs worked out of it with the generator pre programed. Have only heard good things about it. Rife/Bare units have over ten times more frequency range than an EMEM. With Rife/Bare units you should be something like 5 feet or more away. They also heat up the Plasma tube. I haven't used a Rife/Bare machine so I can't say that they are better or worse than my EMEM. Most that I have talked with on the internet are split down the middle on which is more effective.