Pocket BF-500D with built-in rechargeable battery can work continuously more than 8 hours;
Only 270g and easy to carry with a belt, bag and headset;
2.0MHz probe (5.0MHz probe to detect umbilical blood stream for option)
Specification：
Ultrasonic frequency：2.0MHz±10%
Power：9V rechargeable battery
Ultrasonic intensity：≤10mW/cm2
Working temperature：10℃—40℃
