Smart Posture Corrector Electronic Back Relief Correction with Sensor Vibration 1. This back support top is comfortable to wear! The high-quality materials are soft and fit to the human body when worn. The high-quality nylon belt is elastic and comfortable. 2. The has a unique figure-eight design that is ergonomic and provides the proper pressure to correct the hunchback, release back pain and improve your good posture. 3. Intelligent sensor reminder: When the user's hunchback bends more than 25, the aligner immediately vibrates to remind him to correct the posture in time. 4. USB charging: 500mA large capacity battery, charging for hour, can be used for 15 days. 5. Use this braces for a long time to easily get the perfect confident posture - stand up and sit up straight. Specification: Material: high strength nylon belt + ABS Battery capacity: 500mAh Power mode: USB charging Suitable for the crowd: children / adults unisex Function: Improve hunchback, sputum, eyesight. Note: 1.Please allow 1-3mm errors due to manual measurement. 2.Due to the difference between different monitors,there are color differences,pls take the real product as the standard! Package Includes: 1 x Back Braces