Have an excellent cooling effect, Keep your system cool with powerful fan speeds up to 1200 RPM. The design is user friendly interface: a 3pin & 4pin two interface design. It can be connected to a power supply or a motherboard, with soft foot pads at the four corners, suitable for desktop computer cases. Color: Rainbow Size: 12cm (diameter) x 2.6cm Interface: dual interface 4Pin+3Pin Voltage: 12V Speed: 1200PRM Air volume: 35CFM Bearing: hydraulic bearing Product weight: 600g WARNING: 4Pin and 3Pin cannot be connected at the same time to avoid short circuit. Note: This product includes 4 cooling fans only, excludes any other item. Due to different lighting and screen settings, the color of the item may differ slightly from the picture. Due to manual measurement, please allow slight difference in dimension. What's in the box? 4 x CPU cooling fan 16 x standard short screws