AED 3 Trainer is the only automated external defibrillator (AED) training solution that uses Real CPR Help to provide real-time feedback on a trainee's compression quality. It allows students to learn the proper rate & depth of CPR chest compression in a training session. Active LCD with full-color rescue images mirrors what a student will see on a clinical ZOLL AED 3 device (not included). An on-device pause button allows the instructor to pause a training scenario. Trainer device ships with training harness, training electrode gels / liners, batteries & operator's guide.