SACKit WOOFit S User Manual page 13

Notice
The battery level of WOOFit S will
only show on iPhone and iPad devices.
Other Bluetooth devices will not provide
information on the battery level.
Bluetooth connection has first priority,
so when you play music from another
Bluetooth device the audio from another
mode (AUX IN or Micro SD Player)
stops.
When you stop playing from a Bluetooth
device, WOOFit S automatically returns
to the previous mode after 3 seconds.
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