Lifepak CR Plus (Fully Automatic / Semi-Automatic) Defibrillator To use the LIFEPAK CR Plus AED, you simply press the release to open the lid and the unit turns "on." It's so simple since there's no "on" or "off" button to press. Once the lid is opened, the voice prompts start talking you through the rescue process. The LIFEPAK CR Plus performs a basic self-check weekly and a deeper diagnostic test monthly. This means you don't have to constantly check the device's status by turning it on. The AED has a readiness display which reveals its status to you even through the carry case. Suitable for: Offices, work places, schools, retail and public places