A cardiac arrest victim can be saved if a bystander takes the right first-aid measures. But not everyone is trained to perform cardiopulmonary resuscitation. Zoll's AED (Automated External Defibrillator) Plus can help you perform CPR through audio and visual prompts. In fact, the device can see exactly what you're doing and give you feedback in real time. It constantly assesses your efforts and provides objective feedback, by informing you if you're pushing hard enough or not. There's also a metronome that can keep you on the right track, in terms of speed. The electrode pad is a single piece, and will be available to you in case a shock is actually needed. With the AED Plus you can assist victims of cardiac arrest, whether or not they require emergency shock treatment.