The Innosonian America-S13108 CPR Clicker Unit is an essential OEM replacement mechanical assembly engineered specifically for the Brayden Adult CPR training manikin series. Installed directly within the internal chest compression housing, this complete clicker module produces an audible sound prompt as soon as a student reaches the AHA and ERC-recommended compression depth of 2 to 2.4 inches (5 to 6 cm). By providing clear, instant auditory cues, it allows instructors to verify proper technique and helps trainees develop accurate depth memory during Basic Life Support (BLS) and Advanced Cardiac Life Support (ACLS) practice.