Product information:

Screen type: 45*25mm / LCD display
Heart rate range: beating 50~240 times/min
Resolution: beat once / minute
Output power: P<20mW
Launch area: <208mm
Working frequency: 2.0MHZ soil 10%
Working mode: continuous wave ultrasound Doppler
Type battery: two 1.5V batteries

Size Information:
Length, width, and height: 135*95 *35
LCD: 45mm x 25mm

Package Content：

1* baby Heartbeat Detector 
1*Coupling agent

1*Instruction