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 cameraThe other side is provided with TF Card , easy to plug the TF CardThere is a +OTG+USB power supply opening on the front, easy to useColour:blackMaterial:Aluminum alloySize:7.3 x 3.3 x 2.3cmPackage Contents:1 x Aluminium alloy CasePls 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.