Designed for professional rescuers, the ZOLL AED 3? BLS defibrillator provides in-depth rescue support for both adult and child victims of sudden cardiac arrest (SCA). The AED 3 BLS not only guides rescuers in delivering high-quality CPR, but is also one of the fastest AEDs in the industry at delivering a shock after chest compressions stop — two critical components to increasing a victim?s chance of survival. ZOLL AEDs set the benchmark for reliability and dependability, empowering rescuers around the world to help save lives.