The 6 Best Fetal Dopplers - wiki.ezvid.com - Little Martin's Drawer sound amplifier
"This sound amplifier from Little Martin's Drawer features a clear display of your baby-to-be's heart rate. You can listen with the included headphones or broadcast the sounds through the speaker, which also doubles as a secure base for storing your monitor."
Best High-Tech Fetal Heart Monitor - checkpregnancy.com - Little Martin’s Baby Sound Amplifier and Recorder
"Unlike the “computer mouse” style of most fetal doppler monitors, the Little Martin’s Baby Sound Amplifier and Recorder are designed more like a cell phone. The probe takes up nearly half of the unit, and it offers an LCD backlit display and sleek external casing."
10 Best Fetal Doppler in 2018 - Rated by My Babies Planet - Little Martin’s Baby Sound Amplifier
Baby Sound Amplifier and Recorder by Little Martin’s Drawer
"Why we love it – With two hearing options, either by headphone jack or through the amplifier built into the base, the Baby Sound Amplifier and Recorder from Little Martin’s Drawer makes bonding with the child you’re expecting a much more fulfilling experience. Because of this, it is one of the top-rated fetal dopplers on our list."