Pocket Fetal Doppler is mainly designed to detect the fetal heartbeat rate from the twelfth week. LCD can display FHR, synchronous FHR signal, battery indicator, volume of sound and alarm indicator accurately. It has a Built-in rechargeable battery can work continuously up to 8 hours. The TFT LCD display for use conveniently at night. It also has an Automatic power off ( one minute), self-detect function, and alarm function when FHR is out of the normal range or battery power is in shortage. Only 270g, can be carried conveniently with a gallus. This doppler has a Built-in speaker and collocated with earphone jack.