ZOLL® M Series® defibrillators are a family of products to meet your clinical needs from BLS to ALS. Products range from AED and advisory defibrillators to manual units and Critical CareTransport (CCT) units. Thanks to the consistency built into each and every defibrillator unit, you train once and use everywhere. Standardization has never been so easy. And due to a uniform operating system, moving between the M Series and the R Series is a breeze.