... volume and column diagram of stroll. 2.4 directions, 8 display Finger Pulse Oximeter with CE approvedFunction:1,Monitoring pulse ... Displaying volume and column diagram of stroll.3, 4 directions, 8 display. Description:1,Display Method: Color OLED display, two ... when no signal is in the product for longer than 8 seconds.Operation Instructions:1 Installing two AAA batteries into battery cassette ...