The R-Go Zepher 4 C2 Dual Monitor Arm uses patented SMART functions, such as a rotation stop for each moving part. This prevents the monitor arm from colliding with an (acoustic) wall. With the R-Go Zepher monitor arm you can place your monitor at eye level and tilt and rotate it as you please. You can easily expand the Zepher with a document holder, laptop holder, Smartbar or an extra arm because of its modular character. The monitor arm can be installed from above the desk, so you can work in an upright position even during installation. No tools are required for installation.