Designed for speed and simplicity. Uses biphasic defibrillation–the most effective at resuscitating in ventricular fibrillation (the most common form of sudden cardiac arrest). Text, lights, and voice instructions guide responder step by step through the life-saving process. Electrode pads are stored in back pocket, ready to apply. “Power On” and “Shock” buttons are oversized and brightly lit. Lightweight and durable: 4.2-Lb. 5-year limited AED warranty, 3-year warranty on battery pack, 1-year warranty on 9V lithium battery, and 2-year shelf life on defibrillation pads.