The Zipp and Zipp Mini both have a 3.5 mm analog input located on their rear side. Use this input to connect the speaker with any kind of device that has analog output (such as a smartphone, tablet, regular computer or a TV).
To do this, connect a mini jack cable between the audio source and the speaker. Ensure that both ends of the cable are properly inserted before starting the music. If the cable has not been properly inserted (or if it is not properly shielded from interference), you will most likely experience a "buzzing" sound.
If music doesn't play immediately, please unplug/plug mini jack from speaker.
Note: Optical input is not supported on the Zipp and Zipp Mini.