Intergrated wireless fully automated fetal heart rate doppler monitor 

Warranty: 1 year
Brand name: Sjnx
Model number: Sjnx
Power source: Electric
Material: Plastic
Shelf life: 1 year 
Quality certification: CE
Instrument classification: Class II
PH value: 5.5 - 8
Viscosity: >15 Pa.S
Battery: AA Battery 
Display screen: 35x34 mm LED light
Speaker: 32mm 8R2W
Power supply: DC 3.0v (AA battery x2)
Ultrasonic operating frequency: 2.5 MHz
Measure range: 65 - 210 BPM
Speed of sound: 1520 - 1620 m/s
Acoustic impedance: 1.5 - 1.7 x 106 Pa.s/m
Acoustic attenuation: < 0.05 dB
Size: 52x40x157 mm