Three working modes
HD Large LCD screen
Intelligent sound insulation
Two ways to listen to the heart rate
Automatic Shut-down when no signal

Model number:FD300
Display:45mm*25mm LCD
Working mode:Continuous Wave Ultrasonic
Doppler
Power:2*1.5V DC battery
Size:(L）135mm*(W)95mm*(H)35mm
Weight :About 180g(including batteries)