[ Newest Case for 4B ] - The case is quiet and powerful and fit for 4B. [ High Quality Material ] - It is made of aluminium alloy, corrugated design, solid, and better heat transferable. Keep your for Pi at a efficient cooling condition, extend service life and improve performance. [ Efficient Heat Dissipation ] - It has temperature control , built-in thermal column, free silicone paste thermal silicone pad. The mental case can efficiently drop the temps for your Pi. [ Hollow-carved Design ] - Reserve PI, , , POE, 40PIN pins and other interfaces, which is more convenient to use and not affect the transmission function of wifi and bluetooth. [ Precise Counterpoint ]: Our cooling case for 4 model adopts advanced and exquisite cutting technology, which ensures each interface can be highly adhered to the mainboard. Colour:Gray Material:Aluminum Alloy Package Contents: 1 x shell 1 set x matching screws 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.