11
The display is off
suddenly
1. The device will power off
automatically if no signal is detected
within 5 seconds.
2. The batteries are almost drained.
1. Normal.
2. Recharge battery.
11. Key of Symbols
Symbol Description
Type BF
Warning – See User Manual
The pulse oxygen saturation(%)
Pulse rate (bpm)
Full-voltage
Low-voltage
SN
Serial number
Shut off the pulse rate indicator sound
Turn on the pulse rate indicator sound
12. Function Specification
显示信息 显示模式
The Pulse Oxygen Saturation（SpO
2
） 2-digit digital OLED display
Pulse Rate（bpm） 3-digit digital OLED display
Pulse Intensity (bar-graph) bar-graph OLED display
SpO
2
Parameter Specification
Measuring range 35%～100%, (the resolution is 1%).
Accuracy ±2% during 70%～100%.Below 70% unspecified.
Optical Sensor
Red light (wavelength is 660nm)
Infrared (wavelength is 940nm)
Pulse Parameter Specification
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