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 240x240x50mm / 9.4 x 9.4 x 1.97 inch ^^
Rated voltage: 5v usb;
Rated current: 0.25A;
Speed: 1100rpm per fan (total 4400rpm); Airflow 38cfm per fan (total 152cfm);
Noise: 28dBA;
Bearing: sleeve;
Lifespan: 35, 000 hours ^^ 20MM
Rubber Feet: 120mm x 4 usb large router fan are equipped with 2cm 0.79 inch 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!