Most converters intended for AA batteries operate either at 1MHz or 2MHz with some fluctuations on either side. A max of 1.5MHz would point to a 1MHz converter. The best ones available, that fit on top of a AA/AAA battery, don't output much more than 300mA @ 1.5V input, reducing to about 25mA @ 0.5V lowest input voltage.
Their claim of having engineered a small homebrew converter IC with a 1.5A output is ludicrous. As usual, no concrete proof of performance is presented.
A 5x improvement on the best IC technology, with high efficiency over a wide current range, and an implied 3A rating for a tiny 4.7uH inductor only make sense at Batteroo, Inc.
Batteroo's standards of electronics engineering:
This is what it takes to make a decent DC to DC converter: