Back & Lumbar Support Cushions Hunchback Corrector Feature 1.Effortless Bad Posture Correction. Adopts ergonomic 8-shaped design to perfectly fit the spine and pull it straight, effectively relieving back pressure, improving your posture as well as soothing plenty of related discomforts. 2.100% Stretchable Breathable Material. Made from resilient nylon, it can be adjusted to accommodate all sizes of bust, and allow your sweat to freely go through to maintain coolness. 3.Doubled Correcting Efficiency. We remove lumbar correction structure (of poor effect) and concentrate all the strength on the back, enabling you to achieve satisfactory change in a very short period of time. 4.Your Ultra-timely Reminder. With a high-precision chip, it can accurately capture your bending angle. When it exceeds 25, a strong vibration will be triggered to remind you of it. 5.Scientific Data Analysis. The number of your bad postures is precisely recorded for your reference, with which you can better develop and improve your own posture corrective plan. 6.Lasting Care for You Spine. 400mAh large-capacity battery is specially used to improve your using experience. Charge it for merely 1 hour, and it will provide your spine with up to 60 days of protection. ation 1.Adjust the belt to appropriate length. 2.Wear it (screen facing outward). 3.Long press power key to turn on machine (it begins to vibrate). 4.First bend, and then straighten your back (vibration stops). 5.Start hunchback correction. Caution 1.In serious cases, patients should go to a regular specialized hospital for treatment. 2.The process of correction is not easy, and it cannot take effect if you do not stick to it. 3.Any stretching posture other than the one listed in this manual is probably harmful and not recommended. 4.Be sure to read the instructions carefully. Specification Item Type:Hunchback Corrector Material: ABS + High-strength Elastic Nylon Belt Suitable Chest Size: 70-120cm/28-48in Working Voltage: 5V Rated Power: 0.4W Battery Capacity: 400mAh Charging Voltage: 5V Charging Time: 1 Hour Standby Time: 1-2 Months Weight: 70g Size:7*7.7*1.8cm/2.8*3*0.7in Product Include 1*Main Machine 1*USB Cord 1*Manual 1*Box