specification: Item Type: Shoulder Posture Brace_x000D_Material: ABS+Strength Elastic Nylon Belt_x000D_Battery Specification: Built In Lithium Battery, Capacity 500MHA_x000D_Adjustable strap length, and super elastic, suitable for various body shapes Features: 1Posture Correction: Correct posture scientifically. Form muscle memory, cultivate upright habits, exercise shoulder muscles, relieve shoulder, neck, and upper back pain. Wear it for long time to improve your hunchback and make you more upright, confident and beautiful. 2Figure 8 Design: Ergonomic, angle sensing, intelligent vibration reminder, immediate vibration reminder when the hunchback is bent over 25. 3Anti Slip Buckle: Easy to adjust, stable and not easy to loose, high strength nylon belt, good elasticity. 4Smart Reminder: Back Brace reminder with smart vibration, Provides smart back support, with automatic memory function, smart sensor, when the hump bends more than 25, it reminds you to sit up or stand upright, and vibrates immediately. 5Concealed Wear: Accords with ergonomics and more close fitting, the material is light and breathable, easy to wear without restraint, the shoulder strap can be adjusted according to the body. PackageList: 1 x Correction Belt 1 x USB Line 1 x Manual