A100S is a Desktop Fetal Doppler with OLED display, which is designed for clinic and small hospital. It is a lightweight and space-saving time fetal doppler, which can be operated at bedside and acted as handset. It is designed for use in the antepartum applications. Product Description OLED display indicates FHR as numeral, trend diagram and outputs fetal heart sound. Patented acoustic design enhanced vivid sound. 6 Modes: FHR mode, Curve mode, Replay mode, Average FHR mode, Manual Count mode, Countdown mode. High Sensitive 2.5 MHz Doppler probe, accurate FHR detection. Date and time can be displayed. 36 hours patient record storage and reply function. Built-in rechargeable battery for 12 hours continuous work Alarm is enabled when FHR runs beyond normal FHR limit range. Medical-use switch power supply guarantee 50,000hrs working life.