Headrest Height Adjustment Hold the handle of headrest to adjust the height of it.There are 6 positions with 1.97" range. The most suitable height could be achieved when one's scruff is fully supported by the headrest. Headrest Angle Adjustment Hold the headrest to adjust the angle of it.There is 120º range adjustment. The best angle could be reached when one could move the neck naturally. Backrest Tilt Angle Adjustment Pull the single rod control lever completely backward and lean against back until a desired angle is achieved,and then return the lever to the original middle position to lock at an ideal angle.There are 4 positions with 25º range. The proper backrest angle can reduce the pressure on the spine. Backrest Quick or Slight Tilt Tension Adjustment Pull the lever outwards,open the tilt tension adjustment handle, and turn it forward or backward into a desired tension for quick tilt tension adjustment or close the handle and turn it forward or backward for slight tilt tension adjustment,and then close the handle and push the lever inwards to the original position to fix it. The synchro mechanism is ergonomically designed to enhance comfort and reduce strain.The back-to-seat adjustment/tilt is 3:1 ratio. Backrest Support Frame Angle Change Lumbar Support Height Adjustment A.While sitting and leaning against the backrest,the angle of backrest support frame will change automatically to offer complete support to one's body B.When tilting,the backrest will alter its angle accordingly, which ensures full touch and support to the body. A.Hold the lumbar support upwards or downwards to adjust the height of it.The adjustable distance is 3.54". B.Suitable height of the lumbar support would bring more comfort. Armrest Height Adjustment Press the two-side armrest height adjustment buttons to raise or lower the armrests.There are 8 positions with 3.15" range. Recommended armrest position: allow arms to rest comfortably on the armrest at a 90º angle while the armrest is 1" higher than the elbow. Arm Pad Swiveling Angle Adjustment Arm pad swiveling angle adjustment: three arm pad positions,18º range for each position is achieved by turning the arm pads outwards or inwards. The best angle could be reached when the arms can rest naturally on the arms pads while working. Arm Pad Width Adjustment Arm Pad Forward and Backward Adjustment Width adjustment:hold and push the arm pads outwards or inwards into a desired width of the arms. There are 1.57" range adjustment totally. Forward and backward adjustment:push the arm pads forward or backward to a desired depth.The range for it is about 1.38". Seat Height Adjustment Pull up the single rod control lever and hold it while raising or lowering the seat to change the seat height.When the lever is released,the seat height is fixed. Since incorrect seat height contributes to back's fatigue,it is recommended that the angle of knees is slightly less than 90º and feet are level with the floor. Seat Depth Adjustment Push the single rod control lever forward to adjust the seat depth (The approximate range is 1.97"). When the pull is released,the position will be fixed. Ideal depth is achieved when the upper legs are on the seat,the lumbar area is in touch with the backrest of the chair,and the back of knees does not touch the edge of seat cushion. Seat Gradient Adjustment A.The gradient of seat can be adjusted by turning the gradient adjustment lever to change the angle of the seat.The adjustable range is 0.79". B.Different gradient would meet your different needs with full comfort.     Operation instruction for unfolding Notebook Stand 1. Press button A with your right hand. 2. Rotate the support board forwards with your left hand untill the click sound can be heard. 3. Turn up the support board by rotating it upward to 90o 4. Rotate the support board rightward to 180o horizontally. 5. Push the support board rightwards and fix it in the most comfortable position. 6-7. Press button B and rotate the support board for adjusting the best position according to different tilt sitting posture. Note:please do not be locked in the first angle position. 8. Rotate and undo the computer layering upwards when using Ipad or Notebook. 9. Pull the computer gears ban out. 10. Rotate the gears ban upwards and undo it. 11-12. Pull the Notebook under the computer gears ban,adjust the computer gears ban to tighten the Notebook. The left picture shows the Notebook is placed well on the Notebook Stand. And the Notebook Stand is adjusted to suit personal comfort.   Operation instruction for folding Notebook Stand 1-2. Pull the computer gears ban outwards with both hands,take the notebook out as the arrows shows in the picture. 3. Withdrawal the computer layering inby. 4. Press the gears ban towards horizontal direction. 5. Rotating downwards and withdrawal the computer gears ban. 6-7. Press and hold button B, rotate and adjust the angle to the first horizontal position. 8. Push the support board to the leftmost position. 9. Rotate the support board towards left to 180º horizontally. 10-11. Press butoon C and rotate the support board downards to 90º 12-13. Press button A and rotate the support board backwards by 90º with left hand,then the support stand is locked automatically with a click sound. The left picture shows the well-folded Notebook Stand. Operation instruction for Opening legrest 1. Pres both sides buttons on each egde under the front part of seat. 2. And it will be locked automatically with click sound after revolving upwards by 150º 3. Open the folded part with revolving forward. Operation instruction for folding legrest 1. Close the unfolded part with revolving backward. 2. Press the same buttons 3. And it will be locked automatically with click sound after revolving downward by 150º