Model ：DBTB0428B2G Size ：40×40×28mm Bearing: Double ball bearing Interface： 4-wire interface Voltage: 12V Current: 1A Power: 12W Operating voltage: 7.0-13.4V Speed up to 18000RPM±10% Radiator noise 54 dB Fan life 70000 hours Air volume: 19.4CFM Additional functions: PWM intelligent temperature control, speed measurement This is a super high speed fan with a monster performance. Because the speed is too fast, there will be some noise, please choose carefully!