As Alf Schneider walked to his car after playing with his bagpipe band on Memorial Day, he suddenly collapsed.

"I blanked out and that's it. The next picture I saw or recognized was already in a hospital bed. I see people looking at me. That's it," Schneider said.

A bystander saw Alf on the floor and started performing CPR.

A 9-1-1 call was made and that triggered the PulsePoint app on the phone belonging to Honolulu Fire Department recruit Josh Moroles, a former Ocean Safety lifeguard.

"He knew where a local AED was and he was ble to provide CPR and apply the AED," Dr. Rick Bruno of the Queen's Medical Center said.

"I've heard it throughout all my training from the beginning and I'm just happy that I was able to use it to its full potential and help another," Moroles said.

PulsePoint is an app that lets users know when someone in the community needs emergency help.

"It comes from dispatch at EMS when someone is unconcious, when someone is in cardiac arrest or other medical emergencies," Dr. Bruno said.

4,000 people on Oahu have the program and there's hope that number continues to grow.

"Our goal is to have everybody who knows CPR to download the app. The faster we can get bystanders to see the patient, the more patients will survive from cardiac arrest," Dr. Bruno said.

After triple heart bypass surgery, Alf is a survivor.

"I am just so grateful that everything worked out the way it could be," Schneider said.

He continues to count his blessings, and there's no app needed for that.

An example of technology saving lives.