Several organizations have developed initiatives to promote safe listening habits. The U.S. National Institute on Deafness and Other Communication Disorders (NIDCD) has guidelines for safely listening to personal music players geared toward the "tween" population (children aged 9–13 years).[22] The Dangerous Decibels program promotes the use of "Jolene" mannequins to measure output of PLSs as an educational tool to raise awareness of overexposure to sound through personal listening.[23] This type of mannequin is simple and inexpensive to construct and is often an attention-grabber at schools, health fairs, clinic waiting rooms, etc.