The Defibtech Lifeline Semi Auto AED is designed to be the easiest to set up and use in medical emergencies. It features all the necessary equipment to provide the most advanced treatment for sudden cardiac arrest. Simple and intuitive, this AED only has two buttons. A green button to turn the unit on and a red one to shock the patient. Using clear, calm voice instructions, it guides you through each step of defibrillation. If needed, the rescuer will be instructed to press the red button to shock the intended patient. Proven to be the safest and most effective when it comes to saving lives. The Lifeline AED uses biphasic technology, a clinically proven waveform and algorithm to deliver shocks and save lives. This is one of the most widely used impedance compensated waveforms which has extensive clinical experience. Making Defibtech Lifeline AEDs excellent defibrillators for first responders, home emergencies, small business owners, government entities and even corporations. Include with the Defibtech Lifeline AED is a Battery Pack (includes 9v Lithium Battery), Adult Electrode Pads, User Manual, Quick Reference Card, Carrying Case, Medical Prescription/Authorization, CPR Rescue Kit, Inspection Tag, "AED Equipped Facility" decal, and keychain mask.