DoubleSight Ergonomic Single Monitor Sit / Stand Lift Arm with Key Board Tray, Wall Mount (DS-ERGO-100WM) This Full Motion Single Monitor Arm ships fully Assembled and clamps in place for a quick and secure Ergonomic Monitor Mounting Solution. No tools required. Accomodates 1 Monitor af any size up to 30", all major brands with 75mm & 100mm compatible VESA Brackets including HP, Viewsonic, Dell, AOC, Acer, Samsung, Planar, Asus, BenQ, LG The DS-ERGO-100WM easily adjusts for Height (up-down 19"), Tilt and Pivot for a truly Ergonomic work environment. The entire Arm can Swivel up to 180 so it can be moved away when not in use. The DS-ERGO-100WM installs easily to your wall. The Arms is preassembled so once attached to the wall, install the Monitor and you're ready to work. Overall Arm Extension 21" to 37" provides the users with total flexibility and freedom of movement on the desk top. Keyboard tray slides 5.5" forward and also tilts up when not in use. Lifetime Warranty - DoubleSight provides a hassle free Lifetime Warranty on all Monitor Stands and Arms, TV Mounts and Mobile Carts