1、SUPPORTED DATA MODE: The expansion board protective case supports all mainstream data modes such as D STAR, C4FM, DMR, P25, etc., has a wide range of applications. 2、SUPPORTED SYSTEM: Support for Linux, for Windows, for Android system, onboard antenna (support extended external antenna), with good compatibility. 3、ALUMINUM ALLOY: The protective shell is made of aluminum alloy, which is light in weight and wear resistant, not easy to deform or corrode after long term use. 4、WITH RESERVED HOLE: The aluminum alloy enclosure has reserved holes, which can easily install expansion boards without affecting the use effect. 5、EASY TO INSTALL: Equipped with screws, this protective case is compact and easy to install and remove, providing good protection for expansion boards. Item Type: Protective Case Product Color: Black Product Material: Aluminum Alloy Working Frequency: U Band Amateur Frequency Application: For Raspberry Pi Zero W 1 x Black Aluminum Alloy Shell