Adjustable Backrest -The computer gaming chair has a waist massage function, which helps relieve waist pressure caused by sitting for a long time. You only need to plug in the massager cord extending from the lumbar pillow to realize the massage function. The back of the computer gaming chair is adjustable between 90 and 175 degrees, making it easy to switch between sitting and reclining positions. Whether you want to lie down for a nap or play games, you can do it easily. Easy to Install -The parts in the package are clearly packaged, and the instructions are clear and clear. Just follow the steps to install. Comfortable to Use -The interior of the gaming chair is filled with highly elastic foam, making it comfortable even if you sit for long periods of time. The padded seat, lumbar cushion, and headrest make long hours of gaming, working, and studying more comfortable and enjoyable. The 360-degree swivel seat and base allow you to move freely, making it easy to reach snacks and soda when playing games, and easy to move around when working to facilitate discussions with colleagues. What's in the box 1 X Gaming Office Chair 1 X Assemble Tool box 1 X Assemble manual