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When you insert a new battery, the sensor’s LED should blink red briefly three times. This is to signal the user that the battery was inserted correctly.In some cases, the red LED does not blink. This happens because sometimes the sensor’s capacitor still holds some power.To resolve this, before inserting a new battery, press the sensor’s button for 10 seconds and then insert the new battery. The button should be pressed when the sensor has NO battery inside. Pressing the button discharges the sensor’s capacitor and enables the LED blink. 
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