Bgears b-Blaster 90mm 2 ball bearing high performance fan. Extreme Speed at 3500 RPM with Excellent Airflow of up to 78 CFM. 3 pin 3 wires connector with 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.