The Zoll AED Plus ensures rescuers respond appropriately whilst resuscitating a victim of sudden cardiac arrest. It teaches them quickly and simply through every important step of the rescue process. Only the AED Plus with its exclusive , one piece electrode can measure the rate and depth of chest compressions during CPR. It immediately tells rescuers how well compressions are being performed. Fully Automatic defibrillator analyses heart and delivers shock without rescuer intervention, Easy to place one piece electrode providing more time to focus on rescue, Fixed escalating energy (120J,150J,200J), Metronome for CPR compression rate, CPR help technology provides real time feedback on depth and rate of compressions, Configurable automatic self tests from 1 to 7 days, 50 mins of ECG and Rescue data, Powered by 10 lithium batteries , Carry case included, 5-year warranty (plus 2 years if registered with Zoll)