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

⏳72h battery life nonstop

📊Second-by-second data tracking

🔔Customizable audio alarm alerts

₨52704

Duties & taxes included

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Sold byAmazon Sri LankaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💤 Stay ahead of your health—track, analyze, and breathe easy every night!

SMART ALARM SYSTEM - Audio alerts wake you if oxygen or heart rate dips below safe thresholds—sleep soundly, stay safe.
DUAL MODE FLEXIBILITY - Instant spot checks or continuous overnight monitoring—your health, your way.
STANDALONE 72 HOUR MEMORY - Track oxygen levels all night without needing your phone—sync effortlessly in the morning.
RECHARGEABLE LIGHTWEIGHT - Eco-friendly lithium-ion battery with no bulky AAA replacements—comfort meets convenience.
COMPREHENSIVE DATA REPORTS - Free PC & mobile apps generate detailed, exportable reports to empower your health decisions.

The EMAY Sleep Oxygen Monitor is a rechargeable Bluetooth pulse oximeter designed for continuous overnight SpO2 and heart rate tracking. Featuring dual modes for spot checks or continuous monitoring, it stores up to 72 hours of data independently, with customizable audio alarms for safety. Its free PC and mobile apps provide detailed reports and data export options, making it an essential tool for proactive health management.

Specifications

ASIN	B09L4SHGXW
Battery Life	72 hours
Best Sellers Rank	#53,747 in Health & Household ( See Top 100 in Health & Household ) #41 in Athletic & Aviation Pulse Oximeters
Brand Name	EMAY
Color	Blue
Customer Reviews	4.4 4.4 out of 5 stars (501)
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.
Number of Items	1
Part Number	EMO-90

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