5.4 Restore factory settings
Press the function button two times, you can hear one beep,
then Press the function button four times rapidly and then
hold it a fifth time until you hear a ring-ring chime, now the
device is reset.
A reset operation is required to make the device enter the
pairing state
6. Battery replacement
6.1 Use the included screw driver
6.2 Open the case and replace the battery with a new
CR2016 battery 3V. (Positive electrode upward), then close
the cover and tighten the screw.
10.