Features: 
Safe for both home use and medical use
Large LCD display Fetal heartbeat rate with blue back light
Built-in loudspeaker allows sound output
User friendly design, small and compact, high sensitivity, easy to operate
Can detect as early as 12 weeks unborn baby blood wall pulse

Specification:
Utrasound frequency : 2.5MHz/3 MHz
Power: rechargeable battery, 9.6V,300mA
Dimension: 129*82*32mm
Machine N.W.: 0.53 kg
Storage temperature: (-10~+40)°C
Shipping method: Air, Sea, Road