Fy Ring Japanese Health Management Device Smart Ring Silver smart ring, convenient design with a case. - Color: Silver - Shape: Ring - Accessories: Case Size: 10 Purchase Date: 2025/3/29 Price: ¥35,200 Purchased at: Bic Camera With warranty Product Specifications Healthcare Functions Steps/Calories, Heart Rate/Heart Rate Variability/Stress Blood Oxygen Level, Sleep Time/Sleep Quality, Body Temperature Changes Battery Life: 7-10 days App Languages English, Japanese, Chinese, Spanish, German, Romanian, Portuguese Materials: Outer case: Titanium, Inner case: Non-Allergy material Sizes 8mm x 3.3mm x 16.5-22.3mm (US6-US13, 8 sizes) US6 & US13: Custom order (Minimum Order Quantity) Please check the manufacturer's official website for details: https://www.medvigilance.com/fyring Selling because I no longer use it. Disinfected. Please confirm the size yourself and purchase with understanding. Returns are not accepted if the size is incorrect.