Available in automatic and semi-automatic models, the Cardiac Science Powerheart AED G3 Plus is ideal for lay rescuers to use in public access defibrillation areas such as schools, athletic fields, and workplace environments. Rescue Ready® technology that self-checks all main AED components (battery, hardware, software, and pads) daily.  The AED completes a partial charge of the high-voltage electronics weekly, and a full charge monthly. Rescue Coach™ and CPR metronome functionality pace users through chest compressions.  In addition, our proprietary STAR® biphasic technology calculates electrical impedance and escalates energy to deliver therapy at an appropriate higher level should a patient require a second shock.