Hitachi BTN1 Owner's Manual page 13

2.2 Line In mode:
When a 3.5mm audio cable is inserted into the LINE IN input,
the speaker will automatically switch to the LINE IN input.
Connect one end of the 3.5mm audio cable to the speaker unit
and the other end to the device you wish to play music from. To
switch back to Bluetooth mode, disconnect the 3.5mm audio
cable.
3 How to clean the speaker
1. Always power off the speaker before cleaning it.
2. Do not use volatile solvents (such as ethanol, rosin, or
toluene solvents) to clean the speaker. These types of
chemicals may damage the speaker.
3. Use a cotton or microfiber cleaning cloth.
4. When cleaning the speaker, do not directly put water
on the speaker's enclosure. Lightly moisten a cotton
or microfiber cleaning cloth and then gently wipe down
the speaker.
4 Low battery warning
When the battery is low in charge, the speaker will output a
warning sound every 1 minute and the power key will flash.
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