ELUTENG Mini 40mm 5V USB Fan Desk PC Fans with L/M/H 3 40 mm, - Black\nProduct Details\n--[3 Level Adjustable Speed] 40mm Mini USB fan with 3 level speed switch, mini size and super light design, perfect for DIY cooling and narrow place, protect your devices and expand service life.\n--[L/M/H Switch] Voltage:3.5/4.2/5V; Air volume:3.5/3.88/4.4 CFM, Rotating speed: 4000/4600/5300 RPM, choose suitable speed level according to different cooling needs. Noise level is 25.6 dB (weak) up to 32.5 dB (strong)\n--[5V USB Powered] Computer cooling fan is perfect for cooling PC/Laptop/TV Box/Receiver/AV cabinet/PS4/Projector/Router/PC Case. You can use it in any place with USB power supply. Not suggest connecting to USB hub.\n--[Metal Grill Protector] Metal grill on both sides, avoid injury to hand and cable damage by blade; Cable protective glue in corner, wear-resistant and not easy to break.\n--[Exquisite Design] Exquisite black spray metal grill, no rust and no fading, protect cable and your.