Not sure if it works

Picks up all the sounds around me in the room but I had trouble finding my own heartbeat. I have an iPhone 5 and the headphone jack is right next the microphone, the directions say to remove the headphones if in the way and record, then listen to the recording. However when I remove the headphones it takes away the record option so you cannot use the stethoscope portion without having the headphones plugged in

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