Bigben iDance BTLSDUDE Manuel De L'utilisateur page 6

4) Low electricity prompt
When the battery level is less than 10%, the audio signal "low battery" indicates
that the battery is not enough. Please charge it timely. When the battery is less
than 5%, the sound will be shut off automatically, please charge it in time and
need to wait for the power to reach 10%.
5) LINE IN Music mode
When your mobile phone or computer doesn't have Bluetooth, you can use
the 3.5 mm cable end inserted into the headphone jack, another in the
product's Line in interface, and then press MODE key switch to Line in, in
switch successfully speaker have a "Line in MODE" voice prompt, and then
you can play through the speaker.
6) Play USB disk
When you want to play what is in your USB key, you only need to insert the USB
key in the USB slot behind the product. Then, press the MODE key till you reach
MP3 MODE. The speaker will say 'MP3 MODE'. You can play your music using
the remote.