b.ring Titanium is a smart ring with Bluetooth 5.1 and IP68 water resistance, compatible with Android and iOS. - Brand: b.ring - Model Name: Titanium - Color: Silver - Bluetooth Version: Bluetooth 5.1 - Compatible OS: Android 6.0 or later, iOS 13 or later - Waterproof Rating: IP68 - Size: Width 7.2mm, Thickness 2.3mm - Includes charging cable, lasts up to 7 hours Ring Size: US size 9 (Different from Japanese sizes) Purchased in October R7 (likely referring to the Reiwa era, so October 2025) and used for one week, but selling because the size didn't fit. Ideal for health management and sleep tracking, it's an easy-to-use product. Thank you for looking.