Features: brand new and high quality High speed 40mm AFB0412SHB DC12V0.35A 40x40x15MM/1.57x1.57x0.59in PWM cooler fan Suitable for a variety of application scenarios,can be installed in CPU radiator, or device that require a 4cm fan. 500-12500 rpm, stable air flow, low noise and large air volume. Long working life at an ambient temperature of 25 degrees Maintenance-free double ball bearing Specifications: Model: AFB0412SHB Specifications: approx 40x40x15MM/1.57x1.57x0.59in Voltage: 12V Current: 0.35A Wiring: 4PIN speed measurement PWM temperature control Speed: 500-12500 rpm 5% Four-line definition: Black is 12V negative which is 12V - Red is 12V positive, that is, 12V+ Blue is the signal line, also called the speed line Yellow is the speed control line, also called PWM line Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 PC x 4Pin PWM Cooling Fan