【DIY Cooling Fan 】Exhaust Fan Designed for cooling cabinet, chassis, server, workstation, computer case, studios, window fans with exhaust and intake, plant tent, crawl space, basement, laundry room, garage, attic, RV refrigerator, X-box, ps4, amplifier, kitchen, humidifier, mushroom, grow tent, etc. 【Variable Speed Control】110V - 220V Fan power supply with speed control function, turn the knob to adjust the speed, 3V - 12V adjustable fan speed，and can turn off the fan . | Input: 100V - 240V 50/60Hz | Output: DC 3-12V 200-2000ma 【Adjustable Wind】 We have taken into account your various needs, the fan can rotate speed from 1800rpm to 2800rpm, providing the most suitable wind to quickly cool your devices down. You can get just the right airflow with the lowest noise. 【Dual-Ball Bearings 】Have a lifespan of 50,000 hours and allows the fans to be laid flat or stand upright. The fan includes an AC speed controller with power switch to set the fan's speed to optimal noise and airflow levels for various environments. 【Small Box Fan 】120x120x25mm / 4.72in(L) x 4.72in(W) x 1in(H) in per fan. Totally Size: 14.17in(L) x 4.72in(W) x 1in(H) | Rated Voltage :12V | Speed: 2800 RPMx3