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. 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 (battery not included) 1 x Ultrasonic Transducer 1 x User Manual

1.8 inch screen with a more intuitive and easy-to-read curve. Easy to use digital display at home Lightweight and portable built-in With large backlit LCD screen, high fidelity, clear sound Listening to your baby's sounds is like music to a mother's ears.