1. LCD display with backlight, can be used in any illumination conditions

2. DSP technology is employed to assure accuracy and reliability of FHR detection

3. High sensitivity probe with 1 MHz in pulse

4. Ergonomic design, portable and convenience

5. Built-in speaker and Sound frequency output port

6. Automatically power off

7. Multi-displaying of FHR: number, battery status indicator, voice intensity indicator