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."
Source: https://wiki.ezvid.com/best-fetal-dopplers
- Little Martin's Drawer
