AN-203A Water Level Monitor User Manual
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3.2 Turn on/off
Turn on: Gently touch inductive switch for 5s with your fingers, the buzzer will
keep ringing. Leave it for about 1s later. Then touch it twice with your fingers
until two Di sounds heard. At this time, the device boots up and can work
normally.
Reset: Touch the inductive switch with fingers for 5s to reset after it boots up.
Join network: The buzzer beeps 3 times indicating it joins network.