SonoTech Pro Sonotech® pro is an advanced Fetal Doppler which can meet all the routine examination requirements of obstetricians. It follows a compact design, small in size and light in weight, It is the ideal portable device for doctors doing field work Compact, lightweight and easy to Operate TFT Colour Display : Diagnostic Representations Standalone 2MHz Water Resistant (IPX4) Probe FHR Display: Bar Graph | Histogram | Waveform Working Diagnostics: Realtime, Average, & Manual Out of Range Fetal Heart Rate Alarm Display Backlit LCD Battery Status Indicator Display +8 Hrs Operation on 2 AA Alkaline Batteries Built In Speaker (=1.8W) with Volume Control Audio Out Provisions: Headphones, PC Recording Auto Power Off on No Signal (8 seconds) Function FHR Measuring Diagnostic Range: 50~240BPM Diagnostics Accuracy: } +/-2 Beats per Minute Working Ultrasonic Frequency: 2.0MHz} 10% Ultrasonic Opt Intensity: Isata < 5 mW/cm2 Ultrasonic Working Mode: Cont Wave Doppler