Features for fetal doppler:BabySound A Fetal Doppler is a safe and easy to use device that has been specially designed for use at home， allowing pregnant women to listen to their unborn baby's heart beat， movements and hiccups from as early as 10 to12 weeks. It is suitable for expectant mother to carry out regular checks on her baby in between routine hospital checks. It can not only reduce the expectant mother’s anxiety but also allow other members of the family to listen to the baby heartbeat. This portable device is also suitable for obstetricians， midwives and pregnant women.It can connect to a computer， CD or Type to record the baby heart sound and share your baby’s heart beat with family and friends via email.2 AAA size batteries (alkaline or chargeable) are very convenient to buy. The batteries can last more than 6 hours for continuous use (depend on capability)Technical Specification for fetal dopplerAll in one designThe probe and main units integrated togetherHigh sensitive doppler probeCrystal clear soundLow power consumptionCompact and lightErgonomic designEasy to useCE approvedUltrasound Frequency 2MHzUltrasound Intensity <10mW/cm2Out put Headset with Volume ControlDouble Audio Output sockets for HeadsetPower Supply: 1.5V Battery x 2 (Type: AAA)Sensitivity From 10 - 12 weeksPC Interface cableBattery Life >360 minutesSafety Standards: CE Certified， EN ISO 13485:2003 compliantConforms to UK and EC Medical Safety Requirements (Medical Directive 93/94/EEC) CE 0482)Dimensions: (L) 110 x (W) 55 x (H) 16 mmWeight: 80g( with 2 AAA batteries)Display: 25*14 mmPackage Content:- BabySound A fetal doppler- Instruction ManualWeight: 80g( with 2 AAA batteries)Display: 25*14 mm