Bears b-PWM 80mm Black 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 4000 RPM with Excellent Airflow of up to 78 CFM. 9 translucent Black blades design for ultimate airflow and low noise level at only 37 db. 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.