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Public automatic defibrillator (PAD), an essential survival intervention for patients experiencing out-of-hospital-cardiac-arrest (OHCA), promotes early bystander defibrillation in pre-hospital settings. 1 First-responder alerting of OHCA events via text-message or mobile-phone application helped shorten first shock delivery 2, 3; however, the response time can be further shortened as up to 70% of the time was spend in searching a PAD. 4, 5 To further promote early defibrillation, the innovative “Hearing AED” system was lunched to activate immediate PAD response. This system integrates a PAD-based alarmer with a mobile phone-based crowdsourcing app and is linked to the dispatch center. The alarmer is a low-cost machine add-on to existing PAD housing, and is activated by a dispatcher during an OHCA event within a 300-m radius. The alarmer sirens a multi-media alarm to attract nearby bystanders and …