Easy to installThe black aluminum alloy material can reduce the temperature of the orange pi board in to a certain extent, and the heat dissipation function is stronger.Aluminum alloy passive heat dissipation works more efficiently and better protects the motherboardThe black and simple design perfectly fits the interface of the corresponding motherboard.Precisely crafted hole positionApplicable :For Orange Pi 4 Note: Not Included For Orange Pi 4 MotherboardColour:blackMaterial:aluminum alloySize:91 x 56 x 23mmPackage Contents:1 x Aluminum Alloy Upper Cover1 x Aluminum Alloy Lower Cover1 x Screw Pack5 x Heat Conducting Pad1 x Cooling Fan1 x ScrewdriverOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.