Usage Tips:Screw hole position =for Raspberry Pi ZERO W main board hole position, with screw M2.5X3. The top opening has a circular hole and a square hole, which can be opened manually according to the requirements. There is a row of LED state windows that can be used to view the state of the board. The side opens with a camera line opening to facilitate the connection of the camera The other side is provided with TF Card window, easy to plug the TF Card There is a HDMI+OTG+USB power supply opening on the front, easy to use Colour:black/Silver Material:Aluminum alloy Size:7.3 x 3.3 x 2.3cm Package Contents: 1 x Aluminium alloy CNC Case Pls Note: only one case, not including for Raspberry Pi ZERO. Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.