Why did the alarm just wake me, even though the data shows oxygen and heart rate were never out of range?

I don't use the alarm option. May have been a sudden drop that you can barely see on the printout. Enlarge the printout and also check the alarm settings as well.

i am looking at emayltd official website, they 've just posted two types of cheaper oxymeter, isn't it weird? None of them look like this...

The do have a cheaper version. Go for this one

Has anyone used this device during the day for continuous recording?

If you are active, wearing it all day wouldn't be practical. I've used it while riding my bicycle (to see if that would put my heart in a bad way - it would, dang it). But it's clumsy to wear, and best to tape it on if doing anything even semi-active. I tape it on at night as well.

Does it record spot readings to history? Or does it only save continuous recordings?

It only records when "Record" is turned on. It does not record spot readings if "Record" is turned off. The memory will record as many segments as you want, short or long, up to a cumulative total of 72 hours.

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EMAY Sleep Oxygen Monitor with PC Software & App | Bluetooth Pulse Oximeter Rechargeable for Overnight & Continuous SpO2 Tracking with 72 Hours Built-in Memory | Gives Informative Report & Analysis

EMAY Sleep Oxygen Monitor with PC Software & App | Bluetooth Pulse Oximeter Rechargeable for Overnight & Continuous SpO2 Tracking with 72 Hours Built-in Memory | Gives Informative Report & Analysis

Product ID: 674167850

Details

Brand
EMAY
Color
Blue
Measuring Range
70% to 100%
Model Name
EMO-90 Sleep
Number of Batteries
1 Lithium Ion

🔋Rechargeable battery, 8-12h runtime

🔔Customizable audible alarm

⏱️72h continuous memory

Description

🔍 Stay ahead of your health curve with EMAY’s smart oxygen monitor—because peace of mind never sleeps.

RECHARGE GO - Lightweight, rechargeable design eliminates battery hassles—ready for your busiest days and longest nights.
SMART AUDIBLE ALERTS - Instant audio alarms wake you if oxygen or pulse dips below your set threshold—never miss a critical moment.
DUAL MODE FLEXIBILITY - Switch effortlessly between spot checks and continuous monitoring to suit your lifestyle and health needs.
COMPREHENSIVE PC MOBILE APP - Download detailed reports, export CSV data, and share professional insights with your physician.
SEAMLESS 72 HOUR DATA STORAGE - Track your oxygen & heart rate trends overnight without needing your phone.

The EMAY Sleep Oxygen Monitor is a professional-grade Bluetooth pulse oximeter designed for continuous overnight SpO2 and heart rate tracking. Featuring 72 hours of built-in memory, customizable audible alarms, and dual monitoring modes, it operates independently without constant smartphone connection. Its free PC and mobile apps provide detailed data analysis and export options, making it ideal for proactive health management and sharing with healthcare providers. Rechargeable and lightweight, it supports uninterrupted monitoring with ease and precision.

Specifications

ASIN	B09L4SHGXW
Are batteries included?	No
Battery Life	72 Hours
Best Sellers Rank	#296,649 in Health & Household ( See Top 100 in Health & Household ) #266 in Athletic & Aviation Pulse Oximeters
Brand	EMAY
Brand Name	EMAY
Color	Blue
Customer Reviews	4.3 out of 5 stars 499 Reviews
Included Components	Device
Manufacturer	EMAY
Measuring Range	70% to 100%
Model Name	EMO-90 Sleep Oxygen Monitor
Number of Batteries	1 Lithium Ion batteries required.
Part Number	EMO-90
Unit Count	1.0 Count

Reviews

J**Y

10.12.2023

I**H

16.03.2026

R**G

7.06.2022

B**S

2.09.2025

B**N

13.11.2024

N**X

18.10.2022

V**R

6.07.2022

F**S

24.03.2025

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