※ Discounted price for a limited time only. The price will go back up soon. ※ [New purchase price: $314 ※ Approximately 47,000 yen now] Oura Ring 2nd generation Heritage model, black color, size US10. Alcohol-sterilized. Operation confirmed and initialized. Comes with a dedicated charger that can be charged. A USB Type C cable is also included as a bonus, so you can use it immediately upon arrival. I was using it until recently, but I am selling it because I am replacing it. The 2nd generation does not require a monthly subscription fee, so it is suitable for those who want to easily start using the Oura Ring, or those who are considering it as a trial before purchasing the current generation. It can be used for about 15-16 hours on a full charge, so there is no problem with measuring one sleep cycle, but if you want to wear it when you go out, you may need to charge it frequently before going to bed. Also, please note that the battery may be consumed and deteriorated with use. Since it is a used item that was used daily, there are fine scratches, scuffs, and signs of use, so please refrain from purchasing if you are concerned about this. ＜Explanation of the Oura Ring 2nd generation from the official website＞ The 2nd generation Oura Ring has Balance and Heritage models, and the colors were Stealth, Black, Silver, and Gold. What is included in the 2nd generation hardware: Infrared (IR) LED to monitor heart rate and respiration at night Accelerometer to capture daily movement, steps, and automatically detected workouts Negative temperature coefficient (NTC) sensor USB charger with white LED Black and Stealth use titanium with diamond-like carbon (DLC) coating Measurement of resting heart rate, heart rate variability, body surface temperature, and respiration at night Tracking of steps and daily movement Automatic activity detection (without location services) Oura continues to support the Oura Ring 2nd generation and provides regular software and firmware updates. Circadian rhythm and chronotype, exploration content, and personalized activity goals are available for both the Oura Ring 2nd and 3rd generations.