* High sensitivity probe with 2.0 MHz in continuous wave. * Automatically power off.. * LCD display with backlight, can be used in any illumination conditions. 
1.LCD display with backlight, can be used in any illumination conditions.
2.High sensitivity probe with 2.0 MHz in continuous wave.
3.Accurate and reliable FHR detection with clear sound.
4.Ergonomic design, portable and convenience.
5.Built-in speaker.
6.Automatically power off.
7.Multi-displaying of FHR: number, battery status indicator, voice intensity indicator.
8.Building-in rechargeable battery and AC recharger. 
 Features:
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 2.0 MHz in continual working principle.
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;
Specification:
1. LCD Display
Dimension: 39×27mm
2. Speaker power : 0.5W
3. Power supply
Built-in rechargeable battery;
Working Voltage: 9V
Continuous operating time: > 5 hours
4. Working Frequency: 2.0MHz±5％
5.Working Principle: Continual wave FHR
a)Effective Area of Ultrasound Energy Converter sensitive Element: 380mm2
Display: LCD display;