A third-party hardware addon for Windows 10? You could have activated Cortana easily with Windows key + C for communication or perhaps you might have turned that off completely for the sake of security! I don't see the point of this on devices running in Windows 10 but I guess that the only useful thing is that it can be useful for embedded devices running Windows 10 on the car or something.
This device by Satechi uses the Bluetooth 4.0 LE technology and promises 2 years of battery life. All you have to do is to press the button to begin communication on the go but that doesn't seem to be the point when you already have a smartphone/tablet having Cortana in there that you can activate it easily.
And this is more or less your opinion of whether this Cortana Button is pointless or not but when it comes to Android or Windows embedded car devices that have the personal assistant feature that can be activated locally without the need for a phone which can also be done the same local way, this is where the Cortana Button is becoming really pointless for me when you can already activate Cortana locally on your computer, tablet, smartphone and other devices that support personal assistant feature without the need for USB, Bluetooth or network connections. It's a wonderful waste of everything spent on making hardware addons like this when you can actually activate personal assistants locally. The only place that's Intranet-ish in terms of the way the personal assistant searches for is the military network. She/he may have known whatever that goes on in the places one military side is in but she/he can't know anything from the enemy side.
