The AED Plus is a user-friendly automated external defibrillator to rescue victims of sudden cardiac arrest & help you provide high-quality CPR. The AED Plus features Real CPR Help, a tool that is able to actually see what you are doing & provide feedback to help you do it well. Audio & visual prompts help you rescue with confidence & clarity. If you are not pushing hard enough, it will tell you to push harder. A metronome leads you to push at the right rate. This defibrillator even shows you the depth of each compression. The device & accessories provide pictures combined with text displays & voice prompts to help rescuers every step of the way. The AED Plus can also defibrillate children up to 8 years age using Zoll Pedi-Padz (sold separately). The automated external defibrillator includes one-piece electrode pad, batteries, & medical prescription. The AED Plus uses inexpensive, consumer lithium batteries that are easy to replace & last five years in standby mode.