The smart ring "b.ring" is a ring-shaped wearable device that works with your smartphone and has health management functions. - Received as a gift, but the size didn't fit, so it's being sold unused. 【Condition】 Unused (shrink wrap removed) 【Product】 Retail Price: 8,800 yen (tax included) Category: Smart Ring Color: Black Size: US size 8 (Japanese size 16-17) Material: Stainless Steel 【Size】 Width: 8mm x Thickness: 2.8mm Weight: Approximately 3g (ring body) 【Keywords】 Smart Ring, b.ring, Health Management, Sleep Management, Sleep Tracking, Heart Rate, Stress Management, Exercise Recording, Blood Oxygen Saturation 【Functions】 【Supports Daily Health】 b.ring is a smart ring that analyzes biometric information just by wearing it, supporting your health. It features a comfortable fit for everyday life and a stylish design. 【6 Functions for Health Management】 ① Sleep Data Recording, ② Heart Rate Monitoring, ③ Blood Oxygen Check, ④ Stress Management, ⑤ Exercise Recording, ⑥ Step Count Recording 【Check Anytime with the Dedicated App】 Easily check the measured data in the dedicated app for health management. Compatible with both iPhone and Android. Integration with Apple Health and Google Fit became available in June 2025. 【Specifications】 Battery: Lithium Polymer Battery Capacity: 17.5mAh Charging Time: 2 hours Battery Life: Up to 7 days Memory: 128kb ROM + / 96kb RAM Data Storage Period: Up to 7 days Waterproof Performance: IP68 Operating Temperature: 0 ~ 50℃ BT Wireless Communication: Bluetooth 5.1 Supported OS: Android 6.0 or higher / iOS 13 or higher 【Accessories】 Set Contents: Ring Body / Charging Cable / Instruction Manual 【Notes】 *This product is intended for general wellness and fitness purposes and is not a medical device. Measurement data should only be used as a reference for health management. We are accepting inquiries. Please feel free to contact us.