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
 4/5/8MHz probe for blood flow detection
 Automatic power-off while putting the probe back to the rack (SD3 PLUS & SD3 PRO)
 Real-time monitoring for daily use
 Record & play with audio playback and numeric display
 Normal AA batteries for easy replacements
 Built-in Li-ion rechargeable battery ensures long working time
 Unique charger stand design