Ultrahuman Ring PRO is a premium smart ring with a fighter jet-grade titanium unibody that tracks your sleep, movement and recovery ~ *Welcome to our store to have your ring size tested. Massive Battery Life: Lasts up to 15 days on a single charge (approx. 12 days in Turbo Mode or 15+ days in Chill Mode), extending to 45 days total when using the included PRO Charging Case. Upgraded Sensors & Processing: Features a redesigned heart-rate (PPG) sensing architecture for better signal quality during sleep and recovery, paired with an on-chip machine learning processor. Enhanced Safety Design: Includes ProRelease Technology, which allows the ring to be safely cut apart more easily in case of finger swelling or emergency. Comprehensive Health & AI Insights: Tracks sleep stages, recovery scores, daily stress rhythm, movement, and integrates with Jade AI (which connects data with blood markers, glucose data, and more). No Subscription Required: Operates with a one-time purchase and has no recurring monthly or yearly subscription fees. ~ Supported Operating Systems: iOS & Android Built-in Heart Rate Monitor: Yes Battery Life: Up to 15 days (Chill Mode) Step Count: Supported Calorie Calculation: Supported Sleep Tracking: Automatic Dimensions: 2.65 mm (Thickness)(varies slightly by size), Weight: 3.3 g to 4.8 g Included Accessories: Ring PRO x1, Charger x1, Type-C to C Cable (1 mtr) x1 Ring Pro ~ • Return and refund are not accept. • Free shipping to HK/Macau when spending over $500 onwards • China area shipping fee $130 + Local SF Express • Two business day shipping. Sent via SF express • Exchange of defective units purchased in 7 days ~ *Photo for reference only