Latest Oura Ring 4 (4th Gen) Black / Size 5

This is the latest model, Oura Ring 4, of the Oura Ring.
This is the 4th generation model with further improved accuracy in sleep tracking and condition management.

[Product Information]
Model: Oura Ring Gen4
Size: US 5
Retail Price: ¥59,800 (tax included)

[Condition]
Purchased in January 2026, used for less than approximately 1 month.

The manual recommends wearing it on the index finger, but I found it inconvenient when washing my face, holding a pen, or operating machinery due to interference. Therefore, I used it on my little finger. I was able to use it without any particular discomfort.

As this is a used item, please refrain from purchasing if you are concerned about minor scratches.
All accessories (charger and USB-C cable are new) are included, making it a complete set.
Operation has been confirmed, pairing has been canceled, and the device has been initialized.

Regarding the battery:
Starting from 100%,
when fully utilized (using nighttime blood oxygen wellness, workout heart rate tracking, etc.),
it decreased to about 30% in approximately 4-5 days.
Please note that this is a reference value as it may vary depending on usage conditions.

There are minor scuffs (small scratches) on the surface of the ring due to daily use. Despite this, I have selected No noticeable scratches or dirt, so please understand and judge from the images.

Please be sure to read the description.
To prevent fraud, we do not accept returns or cancellations. Thank you for your understanding.