❆[Well Protected, Flexible Placement] - The usb cooling fan both sides metal guard grills (for each fan), 8 pieces silicone feet (for each fan) can absorb the vibration, stabilize the fan and allow the fans to be laid flat or stand upright according to your needs. ❆[Ease of Use, widely applicable] - The computer fan usb 5V USB port can be found behind most electronics or simply to use a charger with USB port. The pc cooling fan usb cool down various electronics and components, such as Raspberry, Playstation, Xbox, Mini PC, External Hard Drive, Home cinema equipment, TV Box, Lap Top, PVR, Game Consoles, Fiber Modem, Internet Gateway, NAS. ❆[Effective Cooling] - The 80mm usb fan MEASURED Air Flow 36.78 * 2 CFM, MEASURED Air Pressure 27.40 PA. The usb computer fan pushes a large amount of air, provides adequate ventilation, effectively lower the device temperature by 10c-20c, prevent the device from overheating, help to improve device performance and prolong the life of electronics. ❆[Low noise,3-Adjustable speeds]- The usb pc fan optimized low-noise design provides quietness of operation,USB fan max.21.2 dB. Speed controller (L/M/H, 1800/2200/2600 RPM) to set the fan's speed to optimal noise and airflow levels. The usb powered fan two fans are controlled by a speed controller and work synchronously. ❆[Long lifespan, Durable] - The usb case fan impact resistance and Fireproof ABS material (compliance with UL 94), dual metal ball bearings, this fan has a lifespan of 10+ year.The computer case fans usb for none-stop using, no less than 70000 hours.