So this is a somewhat complex issue. On the one hand we want people with all kinds of levels of ability to enjoy our game while on the other, we are committed to making sure that there's a level playing field and no one has unfair advantage over their peers.
I've never used the ASUS Sonic Radar so I have no insight in whether it gives any advantage over just being able to hear the game through your earphones. I don't really see how it would since I'm able to locate enemies ingame through the use of sound alone and if someone isn't able to do that, the radar would bring them up to that level. As long as the above is true, I don't see why we would restrict its usage in game.
Unless, of course, it gets incorporated into some cheat where the radar is used to locate players (esp cheat) while masquerading as still being a sound radar and we can't detect the difference between the two, we may have to restrict its use. Even in that scenario, we would most likely block you from entering the game while the radar is running rather than ban everyone who uses it to avoid banning innocent players.
TL;DR it should be fine to use as long as it's not revealed to grant unfair advantage or gets co-opted into a cheat.