R-Go Zepher 4 C2 Monitor ArmR Go Zepher 4 C2 Monitor Arm A rotating stop for each moving part is one of the unique SMART features used by the R Go Zepher 4 C2 Single Monitor Arm. As a result, there is no chance of the monitor arm hitting an acoustic wall. You can position your monitor at eye level, tilt it, and rotate it however you like with the R Go Zepher monitor arm. The modular design of the Zepher makes adding a document holder, laptop holder, Smartbar, or additional arm