Mic_ ,
You'll need an iOS device (something with a camera and wifi) or an Android device(again something with a camera and wifi)
The camera is only needed to scan the QR code for setup wifi is needed for communication.
Currently they are the only Phones which have an app.
As dave w pointed out there is currently no way to connect via a PC.
If/when the Protocol is released this may happen from a thirdparty.