Symptom
Possible Cause
Description & Solution
In ear or forehead mode, T <
32ºC (89.6ºF)
3 short beeps and red backlit for
3 seconds.
2.5V±3%
≦
power
voltage
≦
2.6V±3%
The battery level is low, it
suggests you to replace the
battery, but you can continue to
use it.
The power voltage is lower
than 2.5V± 3%.
It will turn off automatically after
30 seconds. Please replace with a
new battery