スマートリング 20号シルバーの買取情報

The item you are referring to appears to be a smart ring named "docomo select RING 1.1." Here are some of its key features based on your description:
- **Model Number**: 4595318648861
- **Color**: 20号シルバー (Silver, size 20)
- **Health Management**: It includes health management features, possibly through integration with dヘルスケア (d Healthcare).
- **Sleep Management**: The ring likely offers sleep tracking capabilities.
- **Battery Life**: It boasts a long battery life of around 9 days.
- **Water Resistance**: It is designed to be water-resistant, suitable for use in the bath and sauna.
If you're looking for more detailed information or specific features, feel free to ask!