4 pieces 4010 40mm 24V DC cooler fan Specifications: - Bearing: Sleeve Bearing - Dimension: 40x40x10mm (LxWxH) - Connector: 2-pin-2.5mm - Wire length: 5.6 inch (150mm) - Weight: 13.5 gram - Air flow: (5.49 CFM) - Speed: (6500rpm) - Noise level: (25.1dBA) - Air pressure: (2.87AmmAq) - Life time: (40,000 hours) - Working Voltage: (21.6-26.4VDC) - Start-up Voltage: (14VDC) - Current: (60mA) Package includes: - 4 pieces 40mm Fan 24V DC - 4 Pack 40mm Fan grill / guard - Screw and nuts mounting kit. Can be used for cooling stepper motor driver, 3D printers, UPS and other electronics, robotic projects.