features : zero pressure: 0,5,10,15,20,25 . palace pressure automatically switched to 20 seconds in advance zero option, automatic real-time analysis of the fm function marking options, the fm frequency automatic counting functions rapid screen calendar clock switching button, the two opted for a fast heart rate phonocardiogram switching button. rapid changes in the calendar clock interface devices, sub-machine address code software installed automatically preserved. two automatic detection of heart rate choice, they do not have the manual set up. palace pressure probe has awakened new functional fetal sleep, guardianship process can be controlled through a wireless remote controller at any time to awaken the sleeping fetus. built large-capacity rechargeable lithium batteries, power equipment and work online rechargeable batteries intelligent judgment without operator intervention. battery status can be filled with more than four hours of continuous work, low battery consumption automatic alarm. hardware monitoring devices embedded software, real-time monitoring equipment engineering operations, reduce equipment failure rate. equipment operating at short notice when there are problems in the course of the closure devices, equipment to improve their security.