This fully automatic AED offers CPR help to assist rescuers in delivering chest compressions at the correct depth & rate for high-quality cardiopulmonary resuscitation. If a shockable heart rhythm is detected, it delivers a shock on its own, eliminating the need for someone to push the shock button. CPR feedback tool sees what you're doing & provides feedback to help you do it well. Audio & visual prompts deliver constructive feedback to help you rescue with confidence & clarity. One-piece electrode pad allows you to make fast & accurate placement.