Feature: 7" LCD color LCD screen, display figure and curve clearly Arousing function, wake up fetus for detect Automatic Fetal Movement Multi-wafer, wide wave beam, high seneitivity. Automatic storage of 10 hours for play back or print out. Built-in speaker, large and clear sound Three-in-one probe, reduce line winding Multi-alarming function: tachycardia and bradycardia alarm, paper-lack alarm Built-in rechargable battery, AC or DC power Convenient to hang on the wall or bed. Set printing time and automatically stop thermal printer, print clearly and truly. Advanced DSP technology, detect precisely and display both figure and curve. Technical Parameters: Probe: multi-wafer, wide wave beam, pulse working mode, high sensitivity Ultrasound Intensity: