LifeSource Bilingual Instruction Guide UB-521 - Manual (Page 8)

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The UB-521 provides accurate readings on wrists with a circumference
between 5.3" and 8.5" (13.5 cm and 21.5 cm).
The unit requires two "AAA" (1.5 volt) batteries to operate (alkaline
batteries recommended). To install batteries (or to replace when "Low
Battery" symbol appears), proceed as follows:
1 .
Slide the battery cover as shown to remove from the device.
2 . Insert batteries into designated areas ensuring a correct match with
positive (+) and negative (-) terminals.
3 . Return battery cover by sliding back on to monitoring device.
NOTE: Rechargeable batteries will not work with this monitor.
HOW UB-521 WORKS
BEFORE YOU START
LifeSource
®
Blood Pressure Monitors are easy to use, accurate and display
clear digital measurements. Our technology is based on the “oscillometric
method”. The term “oscillation” refers to the measure of vibrations caused
by the arterial pulse and is a non-invasive method to determine blood
pressure.
Our monitors examine the pulsatile pressure generated by the arterial wall
as it expands and contracts with each heartbeat against the monitor’s cuff.
This monitor measures your blood pressure while the cuff is inflating.