Amped Wireless REA20

High Power 700mW Dual Band AC Wi-Fi Range Extender

Product page

Per Amped Wireless' product page...
 * The device has one dual-band antenna and one dedicated antenna for each of the two bands.
 * This device uses four 5GHz 700mW 2-Stage amplifiers, two 2.4GHz amplifiers, and four advanced LNAs.
 * The processor clock speed is 660MHz.
 * This would seem to indicate the device is using RTL8197D.. which would not be unexpected. The Wi-Fi radio ASICs are likely RTL8812AR and RTL8192CE.