This Powerheart automated external defibrillator comes with RescueCoach and CPR metronome to pace chest compressions. It is rescue ready in case of an emergency. It self checks all of its main functioning parts, including the battery, hardware, software, and pads daily. This makes sure that the AED will be in proper working order should you need it. It also completes a partial charge of the high voltage electronics weekly, and a full charge monthly. The AED can calculate electrical impedance, and the STAP biphasic technology can up its energy levels to deliver a second shock and the delivery therapy needed at an appropriate, higher level. This device is designed to make rescue as simple as possible, so anyone can operate it. It comes in automatic and semi-automatic models. The Powerheart comes with a seven year warranty and a four year battery operational replacement guarantee.