DescriptionThis product is a smart posture corrector, made of ABS material, high-quality and durable. It can effectively improve hunchback and eye distance. A good helper for you to improve yoursitting posture. Choose it for you.Features- Color:Black.- Material: ABS.- Size: Approx.10.40X8.60X2.00cm/4.09X3.38X0.79in.-Rated Voltage: 3.7V.-Rated Power: 0.22W.-Rated Current: 0.06A.-Made of high-qualityABS material, durable and practical for long-lasting use.-Ergonomic design, fits the curve of the human body when worn, comfortable and does not hurt the shoulders and back.- It comes with the intelligent sensor vibration reminder, if the humpback angle passes 25 degree, the smart posture corrector will sense and give vibration reminder. After you straight your back, the vibration will stop.-It is used for spine correction, chest extension, improvement of kyphosis, and prevention of rickets, myocardial infarction, syncope, asthma, etc.- Invisible design, you can use it anytime and anywhere, not effecting your study and work.Packing list:1 x Smart Posture Corrector1 x User Manual