This is a 9-layer acrylic case designed for Raspberry Pi 4 Model B It's Made of acrylic material that will not affect signal transmission, the Raspberry PI 4 shell perfectly protects your Raspberry PI 4 board and can check the operating status of the Raspberry PI 4 board at any time. Assembly is easy for beginners and amateurs Easy access to all ports It has powerful heat dissipation function Note: Designed for Raspberry Pi 4, it is not compatible with other Raspberry Pi models. The package is not include the Raspberry PI board.