Screw hole position =for 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 the state of the board. The side opens with a camera opening to facilitate the connection of the camera The other side is provided with TF Card , easy to plug the TF Card There is a +OTG+USB power supply opening on the front, easy to use Colour:black Material:Aluminum alloy Size:7.3 x 3.3 x 2.3cm Package Contents: 1 x Aluminium alloy Case Pls Note: only one case, not including for . Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.