Package includes 1 Piece - usb connector Small DC fan 5v 25mm x 25mm x 7mm You can plug this into any stand USB socket, like a portable battery. Parameters: Dimensions: 25x25x7mm Connector: usb Rated Voltage: DC:5V Rated Current: 0.15±10% Amp Rated Speed: 10000±10%rpm Air flow:2.12CFM Noise: 24±10%dBA Bearing Type: Sleeve Life: 35000 hours Cable Lenght: 10cm Weight: 5g/pcs