Model A8200S2 Fetal Doppler is a low- cost and high performance fetal heart beat detector. It can detect real-time FHR(Fetal Heart Rate) and average FHR. It is applicable for the private obstetrician's office, antepartum clinic, obstetrical department of hospital and remote monitoring situations, or using in home. It has a large LCD screen display the FHR, and an audio output port connected with earphone or recorder with audio input. It uses 9V battery standby for 3 months or continual used for 5 hours. FEATURES Lightweight and portable, Easy-to-use Long life design, dust proof Large backlight LCD display FHR Built in Hi-Fi speaker, clear fetal heart beat sound Accurate FHR detection, has real-time FHR mode and average FHR mode High sensitivity interchangeable probe Audio output port Optional rechargeable battery and charger.