Sonoline B is the original baby heart rate tracker from Baby Doppler®. Listen to your baby's heart rate anywhere and at anytime using the most trusted fetal monitor on the market. Get reassurance and the ultimate bonding experience! Listen to your baby’s heartbeat as early as your 12th week of pregnancy! Features: 1. A back-lit LCD screen to easily see the bmp (beats per minute), 2. Intelligent Noise Reduction and MedHD Speakers for the optimal sound 3. A High Accuracy 3 MHz Probe that is sensitive enough to be used throughout your pregnancy Original owner, purchased new, used during my pregnancies. Comes with ultrasound gel; bottle is opened but still over halfway full, last used end April 2024. (Baby born 4/23/24)