With simple design, easy to use at home. The built-in speaker with volume control and backlit LCD display help to find the position quickly. 3 Display mode on backlit LCD display, and built-in clear speaker with volume control and earphone port available for listening quietly.High sensitivity, 0 radiation, convenient measurement (low power, 0 micro radiation, high performance, intelligent dynamic monitoring). No one wants to miss the growth of kids. Listening to your baby's sounds is like music to a mother's ears. Also this will helps your love being able to experience this together at home, so your husband feel like he can be a bigger part of this process. Specification: Power: AA battery （Battery included) Ultrasound frequency: 2.5MHZ Display 40mm X 25 mm LED FHR Measuring range: 65-210bpm FHR resolution bpm FHR accuracy:±2bpm Output ultrasonic power<30mW Dimension:130.70×62.50×34.0mm Safety type Type B application part How to use: Before using it for the first time, make sure 2 batteries are in. Press the power button to power on, then adjust the volume. Lie flat with a cushion pillow, keep legs straight and relax. Attach the probe to the abdomen to locate the position and find out the best direction to the heart. After hearing regular heart sound, the FHR value will display on the screen in real time. Time Weeks: not less than 12 weeks. Package: 1 x Main Monitor 1 x Ultrasonic Transducer 1 x User Manual

Large Screen: 1.8"screen with a more intuitive and easy-to-read curve. Easy to Use: Easy to use digital display at home. Lightweight and Portable Built-in: Speaker with volume control, on / off switch, volume control, headphones and speaker are all doable. Easy and Convenient to Use: With large backlit LCD screen, high fidelity, clear sound. Nice sound: Listening to your baby's sounds is like music to a mother's ears.