... Displaying volume and column diagram of stroll. 2.4 directions, 8 display Finger Pulse Oximeter with ... ,Displaying volume and column diagram of stroll.3, 4 directions, 8 display. Description:1,Display Method: ... batteries can be operated continuously for 30 hours.4 Low voltage warning will be indicated in ... thoroughly) before releasing the clamp4 Press the switch button once on front panel.5 Your finger ...