The Riva Concert sounds excellent—almost as good as a Sonos One—and it comes with tons of extra features. It has an app like Sonos that lets you connect multiple Rivas together, multi-room style, but that’s just the start. It has Bluetooth, Spotify Connect, an aux 3.5mm connector (headphone cables), and a USB-A port so you can directly listen to audio if you have actual files to play. It doesn’t have a battery out of the box, but Riva sells a special battery Power Pack for $59 that gives the Concert 20 hours of battery life. Just flip the switch to portable mode and off you go.