Designed with innovative technology that has produced an effective defibrillator so easy to use that you can potentially save the life of a co-worker, friend, or anyone else stricken with sudden cardiac arrest. Clear, natural voice instructions guide you through each step of defibrillation. Designed to not slow you down or leave you behind. It even reminds you to call EMS. On-demand CPR coaching. On the job, this unit automatically conducts self-tests every single day, not just weekly. It performs over 80 different tests in all: even the pads are tested for readiness. The electric medicine delivered by the OnSite is the most proven in the industry. Philips' high-current/low-energy therapy ensures a potent defibrillation dose while minimizing side effects. Weighs just 3.3 lb.