It's a blatant rip off, trying to be a simplified Mooshimeter - (I think it is the original) Bluetooth+Smartphone app 2-ch 24-bit A/D multimeter. That Kickstarter, which went through FCC and 61010 approvals, was many years ago...
Its the same idea, but hardly a blatant ripoff. Almost nothing in the physical design or look and feel of the app is the same.
Anyway, it looks like mm have stopped production, its marked as sold out on their page and "obsolete" on digikey. I have one and its very useful for remote logging, but not day to day use.
Having a rechargeable version would be good but: it would cost a lot more, and would have been hell to pass certifications (as they stated any cover or port protection has to be open during high voltage testing, this is why the SD slot had to be covered up).