BF-500D+ --Blue backlight LCD display for use conveniently at night; --LCD can display FHR, synchronous FHR signal, battery indicator, volume of sound and alarm indicator accurately; --Pocket Fetal Doppler mainly applies to detect the fetal heartbeat rate from the twelfth week; --Audible and visual alarm for abnormal FHR; --Built-in rechargeable battery can work continuously more than 5 hours; --Automatic power off ( one minute), self-detect function, and alarm function when FHR is out of the normal range or battery power is in shortage; --Only 270g, can be carried conveniently with a gallus; --Built-in speaker and collocated with earphone jack; --2.0MHz probe. --mobile app support --CE certification l EExecutive Standard: EN61266:1995 l Ultrasonic frequency: 2.0MHz¡¨¤10% l Ultrasonic intensity: ¡¨¹10mW/cm2 l Comprehensive Sensitivity: ¡Y90dB l FHR range: 60--210bpm(¡¨¤2bpm) l FHR alarm range: ¡¨¹100bpm or ¡Y160bpm l Isptp: ¡¨¹0.1MPa l Battery: 8.4VNi-MH rechargeable batteries and charger (optional for 9V dry battery ) l Maximum audio output intensity: ¡¨¹1W l Doppler frequency: 100--3000Hz l Static continuous working time: ¡Y2h l Automatic Dormancy time limit:1 minute l Working temperature: 10-40¡æ l Humidity: ¡¨¹80% l Atmospheric pressure: 86--106kPa l Single Unit Dimension: 24cm x 23cm x 12cm Gross Weight:1.5kg l 20 pcs/carton Dimension: 44cm x 36cm x 42cm Gross Weight: 18kg Normative collocation: charger, earphone, gel, small bag, gallus, operation manual, approval