Bgears b-PWM 140mm Blue 2 ball bearing high speed high performance PWM technology fan. PWM Technology with mini 4 pin 4 wire connector to connect directly to the Motherboard fan connector for ultimate fan speed monitoring thru Motherboard. Extreme Speed range from 500 to 1800 RPM with Excellent Airflow of up to 110 CFM. 15 translucent Blue blades design for ultimate airflow and low noise level at only 35 dBA. 4 Blue LED to enhance the lighting effect. Mini 4 pin 4 wires connector with PWM fan speed signal output. Include a 3 to 4 pin Molex adapter for direct connection to Power Supply. 4 screws included. Customer Service: Supportatbgears.com or call 510-657-7252. RMA Service: RMAatbgears.com or call 510-657-7252.