LCD can display FHR, synchronous FHR signal, battery indicator, volume of sound and alarm indicator accurately;

Built-in rechargeable battery can work continuously more than 5 hours;

TFT LCD display for use conveniently at any ambient light;

Automatic power off ( one minute), self-detect function, and alarm function when FHR is out of the normal range or battery power is in shortage;

Only 270g, can be carried conveniently with a gallus;

2.0MHz water proof probe.