The "Baby Doppler Sonoline B" allows you to easily check your baby's heartbeat at home. This fetal doppler is the No. 1 most popular item in America, providing peace of mind during pregnancy. *The main unit is a medical device, so only the accessories are included. 【Features】 ○ Built-in speaker ○ Headphone socket ○ Volume control ○ LCD display with backlight ○ The display shows the fetal heart rate (FHR) and battery status. ○ Three mode selection buttons: Real-time FHR, Average FHR, Manual mode ○ Detachable probe ○ 3MHz probe for maximum sensitivity ○ Auto power off 【Condition】 Used only a few times. Operation confirmed. 【Accessories】 Box, Instruction manual.