This is a High Quality Aluminum Alloy Case for your 3B+/3B. With a big size heatsink and cooling fan can give better heat dissipation. Quiet cooling fan and open case design, help you rid of the fan noisy and wifi sign problem. For Dual Fan: Low Power Consumption Design Dual Cooling Expericnce, More powerful heat dissipation Quiet Cooling Fan, rid of the fan noisy All of the Fans were Tested by , Quality Control Update Thermal Tape Can Make Best Heat Conduction Effect For Aluminum Alloy Case and Heatsink: Perfect suitable for 3 Model B+ /3B Big Size Heatsink and Cooling Fan Can Make : More powerful heat dissipation High Quality Aluminum Alloy Case Can your Pi Safe Open Design Can Make Case will not effect Wifi Signal Reinforced aluminum material, lightweight and durable, long-lasting stainless Note: is NOT Included Size: 8.5* 5.5*2.2cm Color: Black Material: aluminum alloy Package Contents: 1 * Aluminum Alloy Case with Dual Fan 4 * Screw 3 * Thermal Tape 1 * Screwdriver Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.