Feature 1.Small and comvenient. Elegant design. Steable performance.2.Battery status indicator3.Output for headphones & recording USB cable4.Standard: 3M Probe5.One piece 9V alkaline battery available which can work no less than 10 hours (not included the batteries)6.The product is a lightweight,portable detector.it is designed to meet your detecting and hearing needs by providing advanced detectingfunctions and a full range of sound of the fetal heartbeat. Specification Anti-electroshock Type: Internally powered equipmentAnti-electroshock Degree: Type B applied partPower Consumption: < 0.8 WVoltage: DC 3.0 VSuitable Using Range: Suitable for use after the 12th week of pregnancyWorking Frequency: 2.0 MHzplusmn10%Ultrasound Output Power: P < 20 mWUltrasonic Output Intensity: Isata < 100 mW/cm2Working Mode: Continuous wave dopplerEffective Radiating Area of Transducer: 208 mm2plusmn15%Physical CharacteristicDimension:(L)135mm times (W)92mm times (H )29mm1.Product name:baby sound c2.Safety: Complies with IEC60601-1: 1988+A1:1991+A2:19953.FHR measuring range: 50~240BPM (beat per minute)4.Resolution: 1 BPM5.Accuracy: +/- 2BPM6.Power supply: two pieces of 1.5V DC battery(size aa lr6)7.Display:45mmx25mmLCD display8.Working temperature: 5C~40C9.Working humidity:=80%10.Atmospheric pressure:76kPa~106kPa11.Storage temperature: -10C~55C12.Storage humidity: =93% Package included 1 x Fetal Doppler(no including battery)1 x English manualSpecification: Package Weight One Package Weight 0.33kgs / 0.73lb One Package Size 19.5cm * 17cm * 7cm / 7.68inch * 6.69inch * 2.76inch Qty per Carton 90 Carton Weight 30.00kgs / 66.14lb Carton Size 87cm * 76cm * 31cm / 34.25inch * 29.92inch * 12.2inch Loading Container 20GP: 130 cartons * 90 pcs = 11700 pcs40HQ: 302 cartons * 90 pcs = 27180 pcs