InstructionsPocket Fetal Doppler is a hand-held obstetrical unit， which can be used in hospital， clinic and home for daily self-check by pregnant woman.It contains components of ultrasonic signal transmitter and receiver， analog signals processing unit， FHR calculating unit， LCD display control unit etc.It has 3 work modes: real-time FHR display mode， averaged FHR display mode， and manual mode. It also has audio output， and can be connected with earphone or recorder with audio input.Main Features■Beautiful shape， portable， easy operation■The probe has bending structure which is easy to operate and can increase the ease of the pregnant women， embodies the humane care design ■Battery status indicator■The probe can be changeable■Probe inspection■Built-in speaker■Output for headphones■Backlight■Auto shut off ■Two pieces of standard 1.5V alkaline battery available which can work no less than 8 hoursMain performanceAnti-electroshock Type: Internally powered equipmentAnti-electroshock Degree: Type B applied part LCD Display: 38 mm×28 mm FHR Measuring Range: 50 ~240 BPM (BPM: beat per minute) Resolution: 1 BPM Accuracy: ±2 BPMPower Consumption: < 0.8 WVoltage: DC 3.0 VPower Supply: Two 1.5V（AA size）alkaline batterySuitable Using Range: Suitable for use after the 12th week of pregnancyAuto Shut-OFF: After 1 minute no signal， power off automaticallyWorking Frequency: 2.0 MHz±10%Ultrasound Output Power: P < 10 mWUltrasonic Output Intensity: Isata < 5 mW/cm2Working Mode: Continuous wave DopplerEffective Radiating Area of Transducer: 157 mm2±15%Physical CharacteristicDimension:(L)135mm × (W)92mm × (H)29mmWeight: About 245g (including batteries)