This product is posture , made of ABS material, and durable. It can effectively improve sitting posture, hunchback, prevent lumbar strain and spinal injury. A good helper for you to improve your sitting posture. Features - Color: Green - Material: ABS, nylon belt - Size: About 15.00X15.00X1.50cm/5.89X5.89X0.59in - Charging Output Interface: Standard interface. - Operating Voltage: 5V· - Rated Power: 0. . - Charging Time: About 1.5 hours. - Charging Voltage: 5V. - Adjustable belt, both children and adults are available. - It comes with the intelligent sensor vibration reminder, if the humpback angle 15°. - Ergonomic design, fits the curve of the human body when worn, comfortable and does not hurt the shoulders and back. - Improve your posture and bid farewell to hunchback. - Equipped with a fast charging data cable, charging more quickly. Package list: 1 x Posture Correction Belt 1 x USB cable