ASUS USB-AC68 DualBand AC1900 USB3 WiFi Adapter
MIMO 3T4R (4x4:3), 4 Antennas (2 x Internal + 2 x External)
DualBand AC1900 (2.4GHz@600Mbps + 5GHz@1300Mbps)
RealTek RTL8814AU Radio
iPerf3 test more than 7xxMbps throughput 
Product Photo
Information & reference :
A small form USB3 wifi dongle, nice looking design with black glossy finishing, a pair of wing (external antenna) extend out with carving design finishing in red, good ventilation lines on both side, this USB dongle really looks cool !! 
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Wireless Performance Test
WiFi performance testings on some of ASUS AC routers as follows :
For the impatient, some of the highest iPerf3 result I've tested :
Don't be fooled by the size, this little chilli padi will complete your modern AC router
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