Specification:

l Ultrasound operating frequency: 3.0MHz (2.5MHz and 2.0MHz optional, deviation from nominal rated acoustic operating frequency is not more than ±5%. 。
l Comprehensive sensitivity: At a distance of 200mm from the probe surface, the comprehensive sensitivity is not less than 90dB.
l Display range: Fetal heart rate measurement display range 65bpm-210bpm. In the range of 65-210bpm, the error: ±2bpm (digital display).
l Ultrasound output power: <20mW.
l Spatial peak time peak sound pressure: <0.1MPa
l The active area of the sensitive components of the ultrasonic transducer is: 1.57 cm2±30%.
l Fetal heart rate detection resolution is 1bpm
l The error of fetal heart rate measurement is not greater than ±2 bpm
l Electromagnetic compatibility: Group I Class B
l Size: 128mmx96mmx30mm
l Weight: approx. 161g (without battery).
l Working environment: temperature: 5 °C  ~ 40 °C, humidity: 15 ~ 85%, atmospheric pressure: 86kPa ~ 106kPa
l Storage and transportation: temperature: -20 °C ~ 55 °C, humidity: ≤93%RH, atmospheric pressure: 86kPa ~ 106kPa

l Display: 39 mm x31mm

l Power supply: d.c.3V (2×AA) dry battery