Description: This Back Stretcher device supports *Spine traction * muscle relaxation *Back massage and support *waist pain * Posture correction * Intervertebral disc herniation *muscle spasm * pinch nerve * Lower back and upper back pain relief Chiropractic 3 different level settings. Level 1 is low Provide the minimum amount of stretch for beginners. Level 2 medium-strength Provides a greater extension for advanced users. Level 3 strength Provides the largest extension for advanced users. You can adjust the level to your size and treatment needs. Use the device 1-2 times a day for 5 minutes each time to stretch the back muscles and restore the natural curvature of the spine. Function:Stretch your back and relieve stress. Let the spinal return to the natural lines and correct postural imbalances. Supportive: Suitable for Herniated, Compressed or Bulged Disk, Spinal Stenosis, Sciatica and Chronic Back Pain etc. Strong and hardwearing: Made of very tough ABS plastic, reliable quality and long service life. Can withstand 330LB(150KG) weight. How do you install the tool? (The instructions are in the package) 1.Use your knees against the bottom and press the shelf alignment slot with both hands. 2.Finger pressure on the lumber panel adjustment gently slide into the appropriate gear.