3). Large backlight LCD displays the fetal heart rate.
4). Built-in speaker gives clear and loud voice.
5). Interchangeable waterproof probe.
6). Automatic shutdown function in case of no work for 1 minute.
7). Fully charge battery enablesto work continuously for over 10 hours.
8). High sensibility can detect the pulse of 12 week fetus.
9). Three calculation modes to calculate fetal heart rate:insatant, 10 second average and manual.