CHX-3A Pocket Fetal Doppler ( LCD Display ) It's used for detecting the fetal heart rate(FHR) at hospital,clinic,family. ? Easy to use ? LCD display ? 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