I don't recommend buying this. Invest time into understanding and securing your local network, and hire capable admins if you manage an office/institution.

Even they note the device is useless on networks with tight security, leaving the "all out" mode it's only viable purpose, and I can't imagine blocking (targeted de-auth attacking) devices you don't own on a network you don't manage being legal in any jurisdiction.

The reasoning behind blocking certain spy-like wifi devices is in my opinion flawed. You simply cannot reach the result marketed here without jamming cellphones as well, so in reality how is this any different, more appropriate or more legal? It's not.

Seems like some people are absolutely desperate to make the cheap Chinese routers + openWRT combo a profitable product. Someone has a stock they need to burn? From a previous failed attempt maybe?