Dynatron Top Motor 80x80x15mm 12 Volt Ultra High Speed PWM Fan-DF128015BU 840556003540 FEATURES: Frame:PBT+30%GF UL94V-0 (Black) Impeller:PBT+15%GF UL94V-0 (Black) Weight:9±2 Grams Operating Temperature:– 10 °C ~ + 65 °C (65 %RH) Storage Temperature:– 30 °C ~ + 70 °C (65 %RH) Static Pressure (mm/H2O):5.90 50,000 Life Hours: PRODUCT SPECIFICATION: DC Fan Size:80x80x15mm Bearing Type:Double Ball Bearing Fan Speed:4000 RPM Noise Level:40.2 DBA Rated Voltage:12 Volt Rated Current:0.45 AMP Max Airflow:48.6 CFM Connector:4 Pin PWM 9" Tail NOTE:PWM Fans are not variable speed control fans on their own. An integrated circuit varies the speed and airflow of a fan using a pulse-width-modulated (PWM) voltage in response to temperature or system commands send typically by a computer motherboard. You can use them to run at full speed from an external supply if you adapt the plug. (PWM Adapter Cables)