Sources can be streamed from your smartphone or tablet using Google Cast, AirPlay, Spotify Connect, or Bluetooth.
When using Google Cast, AirPlay and Spotify Connect, please note that your device should be in range of your wireless network for the streaming to be successful.
Bluetooth communication on the other hand goes directly to the speaker, and your device therefore needs to stay in range of the speaker. Depending on your surroundings, Bluetooth range is approximately 10 meters.