* 3.5”inch color LCD display
* Ultrasonic wave mode: Continuous wave or Pulse wave
* Built-in speaker.
* Automatic switch-off.
* Waterproof Interchangeable probe
* Various FHR Display mode : Graph Mode , Large Number Mode(real-time and average time), Manual Mode
* Volume indication、battery energy indication、Probe Frequency Display, Date and Time display.
* Sound alarm function when FHR is out of the normal range
* Built-in rechargeable batteries, continuous working time ≥8 hours
* Set-up mode for function setting.