Worth stating on here - I would stay well away fro CPlay2air. I ordered mine a while back, and when it finally arrived I got it all plugged in and seemed to be working at first. I think followed the instructions for the Firmware update (which they suggest running at the time of installation). This process completed, and I was sure not to unplug the device whilst it was updating (as I know this can cause issues if a firmware update doesn't complete properly). However, it never worked again after this. I had some back and forth with CPlay2air, who initially were helpful, but once it became apparent that the device was faulty, they said I had to return at my own costs, and that they weren't willing to cover shipping costs. They also wouldn't send out another device until I had returned the faulty one. I didn't want to risk this again, so I spoke to my bank who agreed that - given the faulty goods - the suppliers should cover costs - so they have disputed the credit card transaction and will get the ££ back for me.
I now understand why there are SO many negative reviews of CPlay2air. I would stay well away. I've also found that there are much cheaper versions of a very similar thing available.
Basically - my advice would be - "don't buy!"