ProductFeatures: Listenandrecordtoyourunbornbaby'sheartbeatwhensheis12week Recordyourownheartbeatandplayitbacktonewbornforacalmingeffect E-mailthebaby'ssoundstoyourfriendsandyourfamily Recordthesoundsasaremembrance CanbeusedwithorwithoutGel.AlsobabyoilandOliveoilarealsoperfectforit Battery-operated(batteryincluded) Specification: Workingfrequency:3.0MHz±10% Humidity:≤90db Spacepeaknegativepressure:≤1MPa Effectivearea:4.8±0.3c㎡ Ultrasoundoutputpower:!#!lt!*!20mW/c㎡ Power:DC9Vdrybattery Size:120*105*65mm/4.72”*4.13”*2.56” Netweight:110g(batterynotincluded) Color:aspictureshows Condition:100%brandnew Packageincludes: 1xfetalDoppler 1xoriginalheadset 1xrecordingcable 1xEnglishusermanual