The system is based around a single chip: AM8251 - a single-core ARM9 system-on-chip built specifically for this purpose.
There's an XDA thread on units similar to this:
and on one of the manufacturers' forums:
The big chip on the other side is a Samsung NAND flash chip, probably this one (K9F1G08U0E).
I don't know what the smaller IC is, but I assume it's the WiFi stack chip.
Small review:It does the job fine especially at 720p. Ironically (or not) AirPlay mirroring has less lag and dropouts than Android mirroring. Tested with iPad Air, Galaxy S5 and Motorola Razr.
Other users are complaining about a lot of dropouts but I'm not experiencing that. I'm sharing the WiFi through a FritzBox 7390, so perhaps the quality of the router also matters.
Unfortunately it cannot fully replace the existing ChromeCast dongle I have so I'm forced to use both: ChromeCast for YouTube videos and EZCast for everything else.
Desktop mirroring is decent, I can stream Amazon Prime ('Instant Video') movies and they are watchable at 720p. At 1080p the framerate is too low. Tested with a Core i7 laptop running Win8.1 through a 300Mbps wireless connection on 5 GHz.