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This is a metal case specially designed for [http://www.orangepi.cn/html/hardWare/computerAndMicrocontrollers/details/Orange -Pi -RV2 .html Orange Pi RV2] by Geekworm, the model is N516. It reserves all the interfaces of the Orange Pi RV2 motherboard, supports the 3010 5V cooling fan installation, supports the extraction of the GPIO cable, and also reserves holes for you to facilitate the installation of external antenna.