Widely Used: This usb cooling fan works great for router, Mac Mini, PlayStation, cabinet, Modem, DVR, Receiver, Streaming ,boxes, x-box, SSD, Security Camera NVR, andriod box, stereo, T-Mobile gateway and other electronic equipment. Dimensions: 120x120x25mm / 4.7 x 4.7 x 1 in per fan. Totally 360x120x50mm / 14.17x4.7x1.97 inch Rated voltage: 5v usb; Rated current: 0.25A; Speed:1100rpm per fan(total 3300rpm) ; Airflow 38cfm per fan(total 114cfm); Noise:28dBA; Bearing: sleeve; Lifespan:35,000 hours 20MM Rubber Feet: 120mm x 4 usb large router fan are equipped with 2cm 0.79inch non-slip and shockproof rubber feet, allowed fan can be placed flat with no slip and leave more space for airflow intake to cool down the device soon. Plug and Play,no assembly needed! No power supply included! Yeiwenl 5V Quiet USB Cooling Fan 120mm x 3 With 1200mm cable,114CFM Big Airflow Cooling for Router, Computer, Mac Mini, PlayStation, Rack DIY Audio Video Network Cabinet Server Cooling Project