From the moment you find out your expecting you can't wait to hear your babies heart beat! With the Pocket Fetal Doppler you may be able to hear your babies heart rate as early as 12 weeks! Zero radiation. Three working modes, Real-time FHR display mode, Average FHR display mode, and Manual mode. HD large LCD Screen, wide screen backlight, to see the number more clearly. Clear Loudspeaker, Low-power design for a more clear sound. and adjustable volume. Automatic Shut-Down, After one minute of no signal, power off automatically, economical and energy saving. Intelligent noise reduction can reduce instrument noise and output more clearly.