Quiet 40mm fan Gdstime 4020 40mm x 20mm Dc 5V Brushless Cooling fan 5500rpm 7cfm Package include: 1 Piece Rated Power:DC 5V 0.14Amp Bearing type:Sleeve Speed:5500RPM Air flow:7.2CFM Noise:22dBA Connecter:XH2.54-2P Cable Length:20cm Or 8 inches Size:40x40x20mm or 15.7x15.7x7.9inches 23g/pcs