It is very simple concept, the small button below used to turn on and integrated voice (in English) describes the selected mode (for AUX jack or Bluetooth when you have to pair).
The apparaige is to perform only once, then the speaker recognizes the smartphone or device with which it has been linked.
You can control everything from the top of the enclosure (bluetooth mode): forward / backward, sound, pause / play and an integrated microphone also allows hands-free calling.
This enclosure has conquered me, and I took him on vacation to tinker, in short, anywhere where I want to have music.