How do I find out what the battery level is on my Hailie™ sensor?

The LED on the main face indicates the battery level of the Hailie™ sensor after the medication is actuated, or when the Status Button or Battery Check Button (depending on the sensor you have) is pressed once

LED Colour

Battery Status


The battery level is good. The Hailie™ sensor is monitoring actuations.


The battery level is low. The Hailie™ sensor is still monitoring actuations.


The battery is depleted. The Hailie™ sensor has stopped monitoring actuations.

No Flash

The battery is depleted, or the Hailie™ sensor has failed, e.g. due to liquid immersion or mechanical stress.

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