Oura Ring 4 Size 9 Purchased from an online shop around January 2025 and used for approximately 6 months. There are scratches, but it is still usable. The battery has deteriorated. This is an offering including the charger set. The original cost was over 50,000 yen including customs, so I'd like to sell it to someone who understands it's a used item, or someone who wants to try it out. Thank you. - Brand: Oura - Model: Oura Ring 4 Thank you for looking.