It gives your Rpi full protection with all the ports available for access:
1 x HDMI
1 x USB microB for power input
4 x USB ports
40-pin GPIO, via rainbow cable
1 x SD card slot
1 x composite video and audio jack
1 x Etherner port
1 x CSI port (camera), need to extend to DSI port
1 x DSI port (display)
It is snap and fit type of casing. There is only 1 screw to secure the casing, but it is optional. While other shorter screws are for mounting brushless fan to the top case! If you do not need the fan, you can keep it.