This device indicates whether the dishes in the dishwasher are clean or dirty.
The device has a tag with word "Clean". If it is visible, the dishes are clean. If it is not, the dishes are dirty.
This is intended to work together with home automation systems. I use Home Assistant. In my case my Home Assistant system track power consumption of the dishwasher. When the power consumptions becomes less than a threshold for certain time, the systems sends a Bluetooth signal to SwitchBot button pusher (which is part of this device). As the result, the "Clean" tag is popped out. The only thing that has to be done manually is to push the tag back before loading the dirty dishes.
My dishwasher has an LED that lights when the wash cycle is done, but the problem is that once I open the door, the LED turns off. After that the status of the dishes inside could not be figured out by that LED. My devise solves this problem.