Out of the box, the Philips HeartStart OnSite Ready-Pack configuration is prepared for rescue. Have confidence that your gadget is deployed successfully and will be available when needed:

It comes with a battery and a pad cartridge already in place. The gadget comes with an extra pad cartridge installed inside the carry case

The first self-test may be started by simply pulling the green tab.
Automated daily readiness checks, including pads, assist maintain readiness.
It's easy to use the HeartStart OnSite Defibrillator. Voice instructions, graphic symbols, and the defibrillator are all activated by pulling the green handle. You will be guided through every step of the procedure, from applying each pad to the patient to administering a defibrillation shock and doing CPR, by following the instructions, which are timed to your actions.