Review on High Gain Wireless Network Adapter - TP-Link Nano USB Wifi Dongle with 150Mbps Speed for PC Desktops and Laptops. Compatible with Win10/8.1/8/7/XP Linux 2.6.18-4.4.3, Mac OS 10.9-10.15 (TL-WN722N) by Chris Reeves

So, as many others have understood and pointed out, there are different versions of this Wi-Fi adapter. Versions 1-3. And apparently version 1 is the only one that supports monitor mode. I think it's a bit misleading to sell Revain and TP-Link not to tell you which adapter version you are buying. Ease of use, functionality etc works well. Whether you need a fast, cheap Wi-Fi adapter for travel, temporary use, or whatever, this will help and do it well enough. Keep in mind that this is nowhere near the current Wi-Fi speed standards of today, but if you don't mind, then by all means conquer your Wi-Fi with this card. But if you want to do more than just connect to Wi-Fi, look elsewhere. This one won't do what you need.