Powerheart AED G3 Defibrillators Powerheart AED G3 Automatic and Semi-Automatic The AED G3 Automatic and Semi-Automatic defibrillators are two dependable members of our automated external defibrillator family. The fully automatic AED administers a defibrillating shock (when appropriate) with no shock button for the user to press. The semi-automatic AED administers a defibrillating shock at the press of a button. Choose the portable defibrillator that's right for you. Features Rescue Ready defibrillator technology self-tests all main components (battery, hardware, software, and pads) daily. Powerheart Automatic and Semi-Automatic Defibrillators complete a partial charge of the high-voltage electronics weekly, and a full charge monthly. Calculates electrical impedance and if subsequent shocks are necessary, our proprietary STAR biphasic technology escalates the energy to deliver therapy at an appropriate, higher level. Warranty: A 7-year warranty on the AED. A 4-year full battery operational replacement guarantee.