Easy Assemble—including a fixing instruction in side package , or you can mail me to get a fixing vedio ADJUSTABLE HEIGHT – The seat height of this gaming swivel chair can also be adjusted with stage 3 hydraulic, which is SGS/ EN1335 (TUV) certified. It can be used as an executive office chair too! RECLINING BACKREST – The PC gaming chair features a 135-degree reclining design that allows the user to relax and adjust the back position to the best angle as per your preference. SUPER COMFORT – This ergonomic gaming chair with footrest ensures superior comfort with a high back and winged seat design, adjustable headrest and lumber support, and PU padded armrests for longer hours of gaming without losing comfort. STYLISH GAMING CHAIR – This video game chair with Footrest boasts a modern black/white leather look and is upholstered in leatherette (PU) material for excellent durability