The LED flashes red to indicate a low battery level after two revolutions.
-
Locate the circular battery cover
on the back of the sensor.
-
Twist the cover counter-clockwise until the marker points to unlocked and the cover is loose enough to remove.
-
Remove the cover and the battery
.
TIP:
You can use a piece of tape 
or a magnet to remove the battery from the cover.
-
Wait 30 seconds.
-
Insert the new battery into the cover, observing polarity.
NOTE:
Do not damage or lose the O-ring gasket.
-
Twist the cover clockwise until the marker points to locked.
NOTE:
The LED flashes red and green for a few seconds after battery replacement. When the LED flashes green and then stops flashing, the device is active and ready to send data.
