A3 Fetal Doppler ( LCD Display ) used for detecting the fetal heart rate(FHR) at hospital, clinic, family. Easy to use. Built-in speaker. Direction of FHR value over-limitation. Built-in rechargeable battery Specification: Ultrasonic Frequency: 2.5 MHz , Dimension?60(L)* 35(W)* 130(H)mm ,Weight : 0.5kg . Continuous work time: 8 hours Configuration: Rechargeable battery. Charger. Manual

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