Sweetie song is a great name for a device like this. Your loved ones heartbeat is always the sweetest sound you can hear. The Sweetie Song Fetal Doppler allows you to hear your unborn loved ones heartbeat. It includes applicator gel to apply to the doppler for clearest sound. the doppler microphone is a mini usb plug with a coil so it's easy to place just where needed. the device comes with two AA batteries which are easily removed. The whole thing comes in a nice display gift box.

Get your own here: https://www.walmart.com/ip/Easy-Home-SweetieSong-Blue-Pocket-Fetal-Doppler-100S6-Baby-Heart-Monitor-Kit-4-pc/50350686