Clicker

A clicker, sometimes called a cricket,[1] is any device that makes a clicking sound, usually when deliberately activated by its user.

"The clickers were dime store crickets that made a nice, loud click, perfect for signaling a First Communion class so all the kids would stand up at the same time, and kneel at the same time, and start filing down the aisle together.

"[7] — Roger EbertClickers were first used by marine mammal trainer Karen Pryor as a way of communicating with their animals.

Dolphins and whales communicate underwater through a series of clicks and whistles known as echolocation, and the clicker allowed a trainer to produce signals they were more likely to understand.

When associated with a treat, a click allows the owner to mark the precise moment the desired behavior is executed.