General description Full aluminum alloy material provides excellent protection for the motherboard. The upper shell features multiple grooves that enhance hot air distribution, while silicone thermal pads at CPU, RAM, and other module positions improve heat dissipation efficiency. A 30X30mm cooling fan ensures better passive cooling. Technical specifications Material: Aluminum alloy Product size: 85 X 56 X 22 mm Fan size: 30 X 30 mm (5V) Package contents: 1 x metal case (upper and lower covers), 1 x cooling fan, 3 x thermal pads, 1 x screw package, 1 x screwdriver Measurement allowed error: +/- 1-3 cm Compatibility and accessories Compatible with: for Raspberry Pi 3 / 3B / 3 Applicable product: for OrangePi 3 development board Installation Simple design with standard screws allows for easy installation.