This is a raspberry pi 3 unit that has Raspian installed.
It also then has the Jishi node-sonos-http-api installed on here ready to go aswell as a file server for you guys to store your music files.
This can then be used by the HC3/HC3L to control your Sonos System and store your music centrally on the network.
See YouTube channel for installation guide HERE
PS the node-sonos-http-api is freely available on the net with guides. You are purchasing the Pi plus my time taken to create a ready to use solution.
RaspberryPi 3 with Sonos Node HTTP-API
Within UK Delivery £5
Within Europe Delivery £30
Rest Of World Delivery £50