Well, I don't have one, but it's essentially a Bluetooth keyboard. "Android controller" sounds like they expect some games/apps to support it natively and you would use that.
In Xperia Play mode, I imagine it just sends the same signals the Xperia Play does (or rather, the app does). If the emulator supports Xperia Play, it should work.
I just found the Gametel on Amazon for $50. Is that what you paid? Because you can get a genuine Sony PS3 controller in black for $40 (Newegg) and use that with the $2 Sixaxis app, and it works with the PS3, and your computer if it has Bluetooth. Or if you know your phone supports it, you can get a USB On The Go cable for under a buck on Amazon and then use any wired USB controller, including the wired Xbox 360 controller ($30 shipped on Amazon, also black). Much less if you're a console gamer and already have either controller.
Samsung Galaxy S3 / US Cellular / d2usc