Sony SRS-BTM30 User Manual

You can reset this unit to its default and delete all pairing information.

If this unit is turned on, press and hold the 1 button to turn off this
unit.

While holding the 1 button, press the ID SET button for 7 seconds or
more.

The 1 indicator (green) and the 

 indicator (blue) flash four times, and this unit is

reset to the default setting. All pairing information is deleted.