This is a High Quality CNC 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 the fan noisy and wifi sign problem.For Dual Fan:Low Consumption DesignDual Cooling Expericnce, More powerful heat dissipationVery Quiet Cooling Fan, the fan noisyAll of the Fans were Tested by Our Engineer, Very Nice Quality ControlUpdate Thermal Tape Can Make Best Heat Conduction EffectFor Aluminum Alloy Case and Heatsink:Perfect suitable for 3 Model B+ /3BBig Size Heatsink and Cooling Fan Can Make : More powerful heat dissipationHigh Quality CNC Aluminum Alloy Case Can Protect your Pi SafeOpen Design Can Make Our CNC Case will not effect Wifi SignalReinforced aluminum material, lightweight and durable, long-lasting stainlessNote: is NOT IncludedSize: 85* 55*22cmColor: BlackMaterial: aluminum alloyPackage Contents:1 * CNC Aluminum Alloy Case with Dual Fan4 * Screw3 * Thermal Tape1 * ScrewdriverOnly the above package content, other products are not included.Note: Light 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.