Features: The product is durable aluminum alloy heatsink shell for development board,multi-directional ventilation and heat dissipation design A ventilation hole is specially set for the built-in fan at the top, so that heat dissipation and cooling are more efficient. Accurate fitting of reserved holes, exquisite manufacturing technology With the anti-slip rubber pad, the placement is more stable, the bottom contact area is reduced Simple assembly, complicated rejection and more stable and safe use. Specifications: Shell model: Case Demonstration board type: ARM Size:approx 147.5x109.6x58.7mm/5.8inx4.3inx2.31in MaterialAluminum Alloy Package Includes: 1PC Metal Case note: The packaging Does Not include Antennas Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.