Dimension: 40mm x 40 x20mm(1.57"L x 1.57"W x 0.79"H) Name: DC 5V 4020 BRUSHLESS FAN Cooling Method: Air Fan Blade: 5 Blades Rated Voltage: 5V DC Rated Current: 0.2A Rated Power: 1W DC Line Length（about): 280mm Power Connector Type: 2-Pin XH2.54 Rated Speed: 7050RPM Air Flow: 9.13CFM Noise Level: 28DB Life Expectancy: 28000H at 40 degree test Operation Temperature: From 1degree to 60 degree This is a brand new fan with features such as low noise, high speed, long lifespan, and easy installation. Widely used in computers( pc ), air purifiers, Case, frequency converters, amplifiers, projectors, welding machines, power adapters and other equipment.