Features · Quality CNC aluminum top cover for Expansion Module assembly · Required for RF Explorer Analyzers and Generators using latest cover design with large power switch plastic cap RF Explorer Spectrum Analyzers and Signal Generators can be enhanced with additional expansion modules, such as RFEMWSUB3G and RFEM24G. These expansion modules are adapted for RF Explorer case where power switch does not include power cap. For latest models where the power switch includes a power cap, you need to use this specific CNC aluminum top cover. For more details visit www.rf-explorer.com/expansion. For questions and support, please visit https://support.rf-explorer.com