You realize that's a MIDI controller, right? It doesn't have sounds built in. You would have to run it through some software in order to play anything. (That said, MIDI controllers can play any MIDI instrument you can imagine.) From the company's description, it looks like they package some soft synths and a version of Ableton with the controller. If you want piano sounds, you'll have to find them.
If you want something you can plug in and play (no messing around with computers or software), I'd suggest getting something like a Casio Privia, which is an actual electronic piano.
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