Connect ???

Hi. I wish to be able to play music from an aux source ie my phone or a set of decks etc through my Sonos system. Is the 'Sonos Connect' the component I need? I have a 3.5 jack to rca lead and wish to use this. The reason for this is we are renting a big country house for the weekend but there is no internet, so i was gonna download a load of tunes via Spotify to my phone and use that as the music source. Any other suggestions would be great.
Thanks