Blaux Finger Pulse Oximeter - Oxygen Monitor with Digital Display | Portable Pulse Oximetry Monitoring Device | Battery-Powered Finger Oximeter | Accurate Blood Oxygen Saturation Monitor for Seniors

"ONE-TOUCH FUNCTION BUTTON Use this button to turn on, adjust brightness, change display directions and manually set up alarms ATTACHED LANYARD Easily attach it to the device for an easy carrying anywhere LOW POWER CONSUMPTION Use 2 x AAA Batteries (Not Included) for a low power consumption.

When the low power indicator comes on, you must replace the batteries BEEPER SPEAKER Manually set up the alarms to notify when SpO2 % and/or heart rate readings exceed a pre-set value"