Aqara JT-BZ-03AQ/A, User Manual

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Preheating
Once the detector is powered on, the buzzer beeps three times and the
indicator flashes red, yellow and green in cycle. After 3 minutes, the
preheating ends and the indicator keeps in green, which indicates that
it is detecting normally.
Self-test
1. In the normal working status of the detector, the indicator is always
green. Hold down the silence/self-test button for more than 3
seconds to confirm that the indicator flashes red, yellow and green in
turn, with three beeps of the buzzer, which indicates that the
self-test is normal.
2. Press and hold the button until the indicator and buzzer repeat the
Tips: In case of use for the first time or non-use for a long time, the
detector should be charged continuously for more than 72 hours for
the optimal detection capacity.
The wireless networking interface of the detector can output a signal
corresponding to its measured concentration and display the
corresponding value in the app as a percentage of the lower explosive
limit (LEL).