Edan SD3 is a new generation fetal doppler as an upgrade of popular Sonotrax Doppler . The most impressive improvement is higher signal/ noise ratio comparing with Sonotrax doppler 

With excellent sensitivity, complete interchangeability and high durability, SD3 series Ultrasonic Pocket Doppler are ideal for routine fetal heart rate detection by the clinicians.

SD plus doppler has a built-in li-ion battery and charger . does not have the capability to record audio

 Plug-and-play
 Compact design with easy one-hand operation
 Bright OLED screen with real-time FHR display
 2 MHz probe with deep penetration for later pregnancy and larger patients
 3 MHz probe detects fetal heart beat as early as 9 weeks
 Automatic power-off  while putting the probe back to the rack
 Real-time monitoring for daily use

Record & play with audio playback and numeric display

 Built-in Li-ion rechargeable battery ensures long working time
  

What included : doppler body , One probe from 2/3/4/5/8mhz probe , carrying case , gel  , li-ion battery , charger .