1 Hour SLOW HEARTBEAT Black Screen Audio Only HD

1 Hour slow heartbeat sound effect on loop — 1 hour black screen — 70 bpm calm.

THIS VIDEO IS A STILL IMAGE — black screen with a small line-art icon in the middle. There is NO ANIMATED VIDEO. Pure audio for hearing-test checks, alarm-replacement loops, study background, sleep timers, or just letting the sound run while you do something else.

#blackscreen #audioonly #1hour

Audio: "70 hartslagen per minuut" by Nederlands Instituut voor Beeld en Geluid (CC BY-SA 3.0), via Wikimedia Commons.