Wellue Checkme O2 Max review

The Wellue Checkme O2 Max is the long-running alternative to the O2Ring. A small unit sits on the wrist and connects to a ring sensor on the finger, which Wellue says stays put at night without the numbness a duckbill clip can cause. The headline spec is battery life: up to 72 hours per charge, which Wellue frames as 7 full nights of tracking, with a 2.5 hour recharge. It logs oxygen, pulse and motion every second, beeps and vibrates when readings cross your thresholds, and stores 4 sessions of up to 10 hours. The free app works with Apple Health and Fitbit, and full reports can be printed or shared without a fee. Wellue lists SpO2 accuracy of plus or minus 2% from 80 to 100% and plus or minus 3% from 70 to 79%. At $183.99 on sale it costs $24.99 more than the O2Ring, and the wrist band adds bulk.

Who it is for

multi-night monitoring without daily charging

Price

$183.99 one-time on sale (list $229.00).

$183.99 USD
Quoted from the vendor pricing page on November 14, 2026.

Key features

• Wrist unit with a patented ring sensor that leaves the finger free to move
• Up to 72 hours of battery life and 2.5 hours charging time
• Beeps and vibrates when oxygen falls or pulse goes outside thresholds you set
• Free app integrates with Apple Health and Fitbit, plus PC and Mac software
• Stores 4 sessions of up to 10 hours each; SpO2 accuracy plus or minus 2% from 80 to 100%

Strengths and weaknesses

• Strength: 72 hour battery covers several nights between charges, against 16 hours for the O2Ring
• Strength: Syncs with Apple Health and Fitbit
• Strength: Full oximetry reports to view, print and share at no extra cost
• Weakness: $183.99 on sale is the second highest price on this list
• Weakness: Wristband plus cable is bulkier than a ring or fingertip clip
• Weakness: Memory holds 4 sessions, so the app has to sync regularly on longer use

Key facts

• Type: Wrist unit with ring sensor, continuous
• Battery: Up to 72 hours
• Memory: 4 sessions, up to 10 hours each
• Wrist size: 13.5 to 21.5 cm
• Price: $183.99

Where it ranks

Wellue Checkme O2 Max is No. 5 in our Best Pulse Oximeters verdict.