Listen.
Sometimes the kids get told and told, and literally, the moment they get done with their business, their memory is wiped. They're gonna miss out on whatever is happening outside the bathroom all the sudden.
The visual cue will help the little tykes flush more often, if you're struggling with them remembering to do so.
I highly recommend it.
It's only a 3 color print (black, pink, white), which again, you're totally capable of doing with or without an AMS system. It's a ~3 hour print or so, and measures 5ish inches tall (~150mm).
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