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❤This Heartbeat Baby Monitor is designed to meet routine examination requirements for pregant women in hospitals and clinics or at home. The intended use of the unit is detection of the fetal heart rate and fetal heart beat sound listening. It is a high performance model with FHR digital and autocorrelation algorithm for high FHR accuracy. The device uses ultrasound technology to detect sounds from the fetus as early as 16 weeks of pregnancy to the baby first moment of life. ✿Specification:✿Ultrasound:Frequency: 2.5MHz Continuous Wave Acoustic Output: Low Power exemption IEC61157 (Clause 6) Fetal Heart Rate: Display: 3 digit FHRRange: 50-240 bpmAccuracy: ±1% or ±1bpm whichever is greaterResolution: 1 bpmOutputs:Headset: 100mW (32Ω stereo headset)Audio Response: 250Hz -1.25kHzPower SupplyBattery: 2 x AAA 1.5V Alkaline or 2 x AAA 1.2V NiCadAuto Shut off: 1 min no signalPhysical Size: 125mm x 48mm x 32mmWeight:80g✿Packing List:✿1 x Fetal monitor (without battery)1 x Earphone1 x English user's manual