Instructions Pocket 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 hours Main performance Anti-electroshock Type: Internally powered equipment Anti-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 BPM Power Consumption: < 0.8 W Voltage: DC 3.0 V Power Supply: Two 1.5V(AA size)alkaline battery Suitable Using Range: Suitable for use after the 12th week of pregnancy Auto Shut-OFF: After 1 minute no signal, power off automatically Working Frequency: 2.0 MHz±10% Ultrasound Output Power: P < 10 mW Ultrasonic Output Intensity: Isata < 5 mW/cm2 Working Mode: Continuous wave Doppler Effective Radiating Area of Transducer: 157 mm2±15% Physical Characteristic Dimension:(L)135mm × (W)92mm × (H)29mm Weight: About 245g (including batteries)