Description:Material: ABS plastic + sponge padLevel: Three gear adjustmentScope of application: cervical spine, lumbar spine, legsMaximum acceptable weight: 250,000 grams / 551.16 poundsPacking size: 400 * 250 * 30mm / 15.75 * 9.84 * 1.18 inchesPackage weight: 540g / 19.05 ounces(Note: Due to manual measurement, please allow slight measurement deviation.) Feature:1. Three levels of adjustment: three levels of adjustable angles, the back arch angle can be adjusted as needed to meet the needs of waist training2. Function: Equipped with 88 massage points corresponding to the body acupoints. It can massage the lumbar spine when stretched, and can correct the sitting posture when sitting.3. Material used: made of high-quality ABS plastic, environmentally friendly, tough and tough, pressure resistant, compact and portable design, easy to carry4. Matching use: There is a soft sponge pad in the middle, which can cushion the impact and provide better protection for the waist5. Applicable places: Whether lying down or sitting, you can use this massager, suitable for home, office, car.