CHX-1A   CHX-1A Pocket Fetal Doppler It's used for detecting the fetal heart rate(FHR) at hospital,clinic,family. ＊ Easy to use ＊ Without LCD display ＊ Built-in speaker ＊ 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