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Product name FD500B FD300B
FDA Cleared Yes
Probe 2.0 MHz 3.0MHz
Suitable Using Range 12th week 10~12th week
Limited Gift Gel+ Batteries Gel+ Batteries
Audio Speaker Yes Yes
FHR Range (beat per minute) 50~230BPM 50~240BPM
Resolution 1 BPM 1 BPM
Accuracy ±2 BPM ±2 BPM
Power Consumption < 0.8 W <0.8W
Power Source 2 x AA 1.5V batteries
2 x AA 1.5V batteries
Auto Shut-off After 1 minute After 1 minute
Working Temperature 41°F~104°F 5~40C
Storage Temperature -77°F~158°F -10~55C
Humidity 25%~80% <80%
Atmospheric Pressure 86~106kPa 70~106kPa
Display Screen 35.0x28mm LCD
44.5x23mm LCD
Weight 200g (include 2 AA batteries) 250g
Dimension 135x95x35mm 130x100x36mm
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