Baby Doppler is the Original Baby Heartbeat Sound Tracker. Listen to your baby's heartbeat anywhere, at any time using the most trusted fetal monitor on the market. Baby Doppler, also known as “Sonoline B”, is the best fetal doppler for expecting mothers to use comfortably at home during pregnancy. The fetal heartrate changes as your baby responds to various conditions in the uterus. Factors include a mother’s activity level and food consumption. Baby Doppler’s pocket-sized pregnancy monitor is perfect for expecting Moms on the go. No matter how busy you are, bond with your baby throughout your pregnancy using Baby Doppler; the baby heart monitor that parents can rely on. Baby Doppler’s Baby Heartrate Monitor 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 4. An exclusive App so, you can share the recordings with everyone including your chosen medical practitioner! Like new! Didn't use as often as I thought. Both gel tubes full.