ElectroCookie Multi-Functional Case for Raspberry Pi 4-1.Noiseless Passive Cooling

Multi-Functional ABS Case for Raspberry Pi 41. Passive Cooling Mode for Simple Tasks and Silent Environment - A large aluminum heatsink makes an efficient heat dissipation without interfering Wifi and bluetooth signals.2. Active Cooling Mode for Heavy Tasks or CPU Overclocking - The enclosed low-noise fan keeps CPU temperature below 44.8°C even under 2GHz overclock stress condition.3. Wall mount for Semi-Permanent Installation - Mounting holes on the back of the case are useful if needs to be installed on the wall.4. Cluster Building - A clustered-computing system is applicable by assembling extra units.