The acoustic working frequency of the device is specified as 2.5MHz, with a permissible deviation not exceeding +15. At a distance of 200mm from the probe surface, the comprehensive sensitivity is guaranteed to be no less than 90 dB. The device is capable of accurately measuring and displaying fetal heart rates within the range of 60 dB to 240 dB. Additionally, the LCD screen features a backlight that can be toggled on or off via a dedicated button, providing flexibility in display visibility according to user preference.
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