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A fetal doppler is a handheld device used to listen to and monitor the heartbeat of a fetus during pregnancy. It works by emitting high-frequency sound waves that bounce off the fetal heart, producing an audible sound that can be heard through a speaker or headphones. Fetal dopplers are commonly used by healthcare professionals, but there are also home-use versions available for expectant parents to use in the comfort of their own homes.Fetal dopplers typically have a probe that is placed on the abdomen of the pregnant person to detect the fetal heartbeat.