Features: Battery status indicator Low power inspection of the batteryBuilt-in speakerOutput for headphonesThe probe can be changeableProbe inspection Backlight LCD displayAuto shut-off functionThree mode: real-time FHR display mode， averaged FHR display mode， and manual mode.It is widely used by hospitals，clinics，midwives and families.SpecificationsSafety: Complies with: IEC 60601-1:1988+A1:1991+A2:1995Classification:Anti-electroshock Type: Internally powered equipment.Harmful Liquid Proof Degree: Ordinary equipment (sealed equipment without liquid proof)Degree of Safety in Presence of Flammable Gases: Equipment not suitable for use in presence of flammable gasesWorking System: Continuous running equipment EMC: Group I Class BSuitable Using Range: Suitable for use after the 12th week of pregnancyPhysical CharacteristicSize: 13.1*7.1*3.5cmEnvironmentWorking:Temperature: +5??C~+40??CHumidity: ?ü80% Atmospheric Pressure: 70 kPa~l06kPaTransport and Storage: Temperature: -10??C~+55??CHumidity: ?ü93%Atmospheric Pressure: 50 kPa~l06kPaDisplay: 44.5mm?á23mm LCD displayBacklight: The two statuses can be alternated: turn off/on the backlight. FHR PerformanceFHR Measuring Range: 50~240BPM (BPM: beat per minute) Resolution: 1BPM Accuracy: ?à2BPMPower consumption: <0.8WAuto Shut-OFF: After 1 minute no signal， power off automatically.Battery Type Recommended: Two pieces of 1.5 V DC battery (SIZE AA LR6)， batteries no include.Probe:Nominal Frequency: 2.0MHzWorking Frequency: 2.0MHz?à10%P-: <0.5MPaIob<10 mW/cm2Ispta: <50mW/cm2Ultrasonic Output Intensity:Isata<5 mW/cm?Working Mode: Continuous wave DopplerEffective Radiating Area of Transducer: 208mm??à15% Package list:1 x Fetal Doppler (Batteries not include)1 x Line-in Cable1 x English user's manual1 x Gel