The aluminum enclosure provides EMI shielding and physical protection Inconspicuous design and color scheme. Black enclosure has matching silkscreen, silver enclosure completely unlabeled for those who wish to go 'incognito' LEDs visible from exterior of enclosure Does not occlude EMI shield frame, if installed (separate, see product ID B01IFAE0RK) Includes all screws and hardware required for assembly, along with silicone feet to ensure your SDR stays where you want it to