Fetal Doppler is used for detect the Fetal Heart Rate ( FHR ) to hear the sound of 12 weeks pregnancy in hospital, clinic even at home. Features: ??* 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. Specification: ??* Ultrasonic Frequency:1.0MHz, 2.5 MHz or 2.0MHz ??* LCD size:3.5 inch (74*50mm) ??* FHR display range:30bpm-240bpm ??* Dimension?230(L)* 148(W)* 100(H)mm ??* Weight : 1kg ??* Continuous work time:? 8 hours