This is an older model, the last they made I think. It's very small.
It has a USB-A socket and an audio output via 3.5mm. It supports AirPlay 2.
You will need the Apple Airport utility to use this but it is available as a free download on the web (but not I think from Apple any more).
You can read about it here and other places on the web: https://en.wikipedia.org/wiki/AirPort_Express