Features:
1. Pocket design, detect baby's heart rate for 9 weeks.
2. LCD displays FHR, battery indicator, signal and probe frequency.
3. White backlight, convenient to use at night.
4. Built-in high quality speaker, collocated with earphone interface, connecting to audio device to amplify and record the fetal heart sound.
5. Standard probe: 3.0MHz, 2.0MHz and 5.0 MHz for option meeting different requirement.
6. Working mode is CW
7. Battery: 3AA Ni-MH chargeable battery, 3AA alkaline battery for option.