1. Easy access to all ports Dual Micro- , audio/video, USB and Ethernet port cutouts, as well as USB-C power connector and microSD card access. makes it easy to insert/remove SD cards. 2. Excellent heat dissipation performance Double cooling Has a strong heat dissipation performance, and the for 4 model B board works, no longer worry about overheating. 3. 9-layer acrylic shell designed for 4 Model B that does not block the Wifi or Bluetooth signal of the for Pi Make your for 4 Model B motherboard and better. The transparent case makes it easy to observe the internal state, and the pi board works to check that all electronic components are working properly. Installation : Start without disturbing the order, take it off from the third floor, place the motherboard on the third floor, and stack the rest one by one. colour:black Material:Acrylic size:The heat sink dimensions are: 14x14x6mm,14x9x5mm,9x9x5mm Package Contents: 4 x for 4 Model B 9-layer acrylic shell 4 x cooling fan 12 x black aluminum radiator 4 x screwdriver 16 x screws (shipped without for raspberry pie motherboard) note: 1. This case is designed for the for 4. Not compatible with other for models. 2. Remove the protective film from the outer casing before assembly. And follow the instructions or videos to make sure it is installed in the . 3. This package does not include the for 4 Model B board. 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.