Made of ABS plastic, environmentally friendly, sturdy and unbreakable, pressure resistant, compact and portable. The back massager is designed so that you can stretch your back easily, safely, comfortably and comfortably. Three different levels can be set to ensure better treatment. You can just lie down twice a day and relax for five minutes. Relief of back pain, improvement of posture. Easy to carry: arc stretch for laying and sitting. Allow the waist to return to the normal 26 degree physiological curve. The backpack is light, can be easily taken with you when traveling or simply enjoyed at home and in the office Acupuncture touch, corresponds to your body acupuncture points, massages your lumbar spine while stretching. With the soft rubber mat in the middle and the impact force of the pad, you better protect your waist. Multi-level adjustment curve for larger ones Easy to use: choose the level that's right for your body and exercise your back in a healthy way to better get rid of the cause of back pain. Product descriptions Size: 38.5x25.5x11cm | Color: Purple Made of ABS plastic, environmentally friendly, sturdy and unbreakable, pressure resistant. For lying and sitting. Allow the waist to return to the normal physiological curve of 26 degrees. It can be used while traveling, at home or in the office. Applicable parts: waist, hips, back Size: 38.5 x 25.5 x 11 cm / 15.16 x 10.04 x 4.33 inches Function: Correction of the spine, improvement of hump / waist acid Package content: 1 x lumbar spine relief 1 x English / Chinese manual