A100F Portable Fetal Doppler is a low-cost and high performance fetal heart beat detector, which can meet routine examination requirements of foetus. It is applicable for using at home. Features: All in one design,the probe intergrated with the main machine High sensitivity FHR doppler probe Optional LCD display the FHR number. Crystal clear sound Light weight and eay to use. Low power consumption Earphone port support FHR sound output to earphone or recorder. Standard Two AAA 1.5V alkaline battery is available for power supply.