... and column diagram of stroll 4 directions, 8 display Finger Pulse Oximeter Function:1,Monitoring pulse, SpO2,PR( ... the Oximeter (it is best to plug the finger thoroughly) before releasing the clamp4 Press the switch ... button once on front panel.5 Your finger do not tremble during the Oximeter is working. ... 3,No.3,Xijing Road,Badachu High-Tech Zone, Shijingshan District, Beijing, China