1. Full aluminum alloy material, protection for motherboard.2. The upper surface of the shell is designed with multiple grooves, which is more conducive to the distribution of hot .3.The CPU, RAM and other module positions are provided with silicone thermal pads to make heat dissipation more efficient.4. 30 x 30 cooling fan better passive cooling.5. Simple design, standard screw, easy installationProduct name: aluminum alloy protection caseAccessory Type: Cases With: for Orange Pi 4 /4B/4Applicable product: for Orange Pi 4 development boardPurpose: heat dissipation protectionFan: 30 x 30mm (5V)Product size: 91 x 56 x 23mmcolor:BlackMaterial:aluminum alloyPackage Contents:1 x metal case (upper and lower covers)1 x cooling fan5 x thermal pads1 x Screw package1 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.