Turning compression depth into a sound
During CPR, a rescuer presses the chest to squeeze the heart and help move blood to the brain and other organs. Depth matters: compressions that are too shallow may move too little blood. But a trainee looking down at a practice manikin cannot easily tell how far its chest has moved.
A built-in clicker makes that hidden movement audible. When the chest reaches the manikin’s preset depth, the mechanism clicks, giving the learner immediate feedback: the push went far enough. If the sound does not come, the trainee can adjust on the next compression rather than waiting for an instructor to spot the mistake.
A cue, not a complete measure
The click turns an abstract instruction—press deeply enough—into a concrete signal that can help learners connect the feel of a compression with its depth. Repeating that connection makes it easier to practice the movement consistently.
The sound reports only one part of CPR technique. It does not tell the learner whether compressions are at the right pace, whether the hands are positioned correctly, or whether the chest is allowed to rise between pushes. Still, for a first-time trainee, one small click can answer a crucial question that is otherwise difficult to judge: did that push reach the target?
