The Zoll M-Series defibrillator is a small, light, bright model with a built-in AC power and battery charger. Zoll's uniform operating system features consistent, straight-forward controls to optimizing patient safety. Recertified Zoll M Series defibrillators can be purchased in monophasic or biphasic technologies. Optional parameters available on the Zoll M Series are etCO2, SPO2, 12-Lead ECG, NIBP, Pacing, AED, Fax and more.