It helps relieve chronic back pain and corrects posture: preventive care for the lower back and body support It relieves activities related to prolonged computer use, sitting all day or physical activity The device will give you a comfortable working experience The device has 3 height levels:6 CM For aspiring users. It is enough to just bend your legs at the knees and place your arms over your body. This position ensures the least amount of stretch and is easiest to perform at the beginning.9 CM This level is for average advanced users. It is enough to place your hands behind your head and bring your shoulders as close to the floor as possible for further stretch.11 CM The third level is for the most advanced users. The final stage allows for maximum relaxation, but also requires higher performance. Technical SpecificationsDimensions: 37 x 22 x 14.5 cm Color: Black, Blue Material: ABS 3 levels of height1 foam belt and 2 acupuncture belts 88 needle tips