# 4 Ceramic - Midnight Smart Ring

- **Brand:** Oura
- **Price:** $399.00
- **Catalog:** ouraring
- **Retailer:** ouraring
- **Product URL:** https://go.cosimo.shop/r/gAAAAABqwNN93_9XiXNF7_siZL1yAVAiCrNtK-R5xZLocW5jdjsjm3Uorm9Zu1V9H4jbCzCorLa7cklvDZ6dRhMpkT4xKV8jO7A6EAF4bGwUWvf3BdlALZRFZ_9taLlcSsiGFubmXBY_6RUmdLUbYSd7mUq5U7Px06AtRZyHX27Q_1Q7Yg8bDallelftVLFU-4dNOkxSTpt4zpjR5PzUVb0t4hw4hx6Lt3IgRtrzrzc25a_Jx2qxVZLXlRKCc6-0cgsFa9Q0XlBEtkOzBf6sxA_q8xDUC-cnP4wOszXHRORIwqnfrooXw9BZG3VRHxUWQ2dNcDmr0geFaRguBGWpCMH89Q9BV2F8x6iX80wuebFFkfn45E7e-J4sjDRzzkuqlAq5Im7oEa6mJ7k1H5kPsMeVgtCebbwwNoHZA8_lqOVs9vNcbG-vj6xDl7oIwq8E8r6FQTDVID2Y
- **Availability:** In stock

## Summary

Midnight blue smart ring featuring a premium zirconia ceramic exterior and a seamless titanium interior for sleep, activity, and wellness tracking.

## Description

Experience the Oura Ring 4 Ceramic in Midnight. Stylish and durable premium zirconia ceramic finish with powerful sleep, activity, and wellness insights.

## Appearance

- **Colors:** Midnight, Cloud
- **Materials:** High-performance zirconia ceramic exterior, Seamless titanium interior, Water resistant up to 100m/328 ft, Minor scratches from regular wear are normal, Erasable scuffs may occur while handling metal objects, Zirconia Ceramic

## Categories

- **Categories:** Smart Ring

## Additional Attributes

- **sensors:** Red and infrared LEDs measure blood oxygen levels, Green and infrared LEDs alternate to measure heart rate and heart rate variability 24/7 and respiration rate, Digital sensor measures temperature trends, Accelerometer tracks movement and activity 24/7
- **material:** Zirconia Ceramic
- **eligibility:** HSA/FSA eligible
- **battery life:** 5-8 days of battery life **, Typically charges in 20-80 minutes, depending on battery level
- **connectivity:** Bluetooth Low Energy, Automatic firmware updates via Oura App, EMF-safe, Supports airplane mode, FCC-certified
- **compatibility:** Oura App is available in English, Finnish, Japanese, German, French, Spanish, Italian, Norwegian, Swedish, Czech, Dutch, and Danish, Supports metric and imperial units of measurement, Integrates with 40+ apps, Available on iOS and Android
- **quality materials:** High-performance zirconia ceramic exterior, Seamless titanium interior, Water resistant up to 100m/328 ft, Minor scratches from regular wear are normal, Erasable scuffs may occur while handling metal objects
- **weight and dimensions:** Width: 7.9 mm, Thickness: 3.51 mm, Weight: 5.1 - 8.1 g (depending on ring size)

## Enrichment

- **Type:** smart ring
- **Type Synonyms:** wearable tracker, health ring
- **Tags:** ceramic finish, titanium interior, seamless design, polished
- **Styles:** minimalist, modern, techwear
- **Colors:** midnightblue, white
- **Color Families:** Blue, White
- **Category Path:** Apparel & Accessories > Jewelry > Rings
- **Jewelry material:** Ceramic, Titanium
- **Pattern:** Solid
- **Ring design:** Band
- **Canonical Brand:** Oura

## Images

- ![Image 1](https://cdn.octogen.ai/cce98d5cf0efe8a284fdddaf1027ca78/830f2571d549b549144f6f95f683b621.webp)
- ![Image 2](https://cdn.octogen.ai/cce98d5cf0efe8a284fdddaf1027ca78/82a4d65d6bbbe2f75623b4d613712cbb.webp)
- ![Image 3](https://cdn.octogen.ai/cce98d5cf0efe8a284fdddaf1027ca78/c432042e079fa252207ba4756ea37e1a.webp)
- ![Image 4](https://cdn.octogen.ai/cce98d5cf0efe8a284fdddaf1027ca78/40b8bd8d13eb370b708368106e021bba.webp)
- ![Image 5](https://cdn.octogen.ai/cce98d5cf0efe8a284fdddaf1027ca78/24f3e7ab2b62b59d5dd6811aeb0c2807.webp)

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*Source: cosimo.shop | Product ID: b76490ea-a2b1-4ab8-a165-325ee58fbc43 | Canonical URL: https://cosimo.shop/product/oura/4-ceramic-midnight-smart-ring-b76490ea-a2b1-4ab8-a165-325ee58fbc43*