Pet Doorbell
The following is a doorbell for humans, modified for a cat to be able to use it. Shown below are 2 videos of a cat using the modified doorbell, and a picture of the doorbell (yellow bar on top of the screen). The doorbell was modified by adding a disk to the push button, off-centered so as to have a lever effect when a cat applies a relatively low pressure on it. The disk is large and colored in a color visible to cats.
Hala Chaoui