Not accurate
This does not accurately get your heartbeat. I tried to get my own heartbeat and I was getting 120 heartbeats when I was sitting at only 60 bpm. and I checked it on my wrist so there was no way it could be confused between me and the baby. It also was very difficult to get the heartbeat to stick around once I finally got it to find a beat. It was just a radial (wrist) pulse and it had trouble!
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Baby Beat™ Heartbeat Monitor