These are man’s greatest invention. I stick my water bottle in front of the sensor, I just about misalign it and the water splashes onto my hand. I stick it in right, and it fills up, but it doesn’t stop filling up until it doesn’t detect the water bottle, which is great, because when I pull my water bottle away from it, it spills out onto the water bottle’s edges.
Clearly, a button would have been too old-fashioned.
I love technology!