The W8600B indicator has four liquid crystal display (LCD) arrowheads that point to On/Battery, Air Cleaner, UV Air Treatment, and Humidifier. A flashing arrowhead indicates service is needed. The indicator can track when the battery, air cleaner filter, ultraviolet air treatment lamps and humidifier pads need replacing. Size 4 x 2½ x 1¾".

The door transmits air cleaner filter change status to the wall-mounted AirWatch Indicator. When the air cleaner filter begins restricting airflow because of accumulated dirt, the built-in pressure sensors in the door detect that airflow is impaired and that the filter requires cleaning. This condition causes the indicator light on the door to begin flashing and the transmitter to send a signal to the wall-mounted RF AirWatch Indicator that the filter needs replacing.

Includes lithium battery (type CR123A) and 2 mounting screws. Requires F200E door with RF transmitter.