7515 5V USB fan wide application: Suitable for hot end cooling, 3D printers hotend, computer, humidifier or other cooling requirements. 75mm Fan, 75mm x 15mm Blower Fan, 5V Dc Brushless Cooling Fan Operating Voltage Range4.5V to 5.5V Rated Voltage: 5V DC Current: 0.4 Amp Power: 2 W Airflow: 6.83 CFM Static Pressure: 0.53 In H2O Fan Speed: 3000RPM Lifespan: 35,000 hrs USB Plug w/35cm cable compatible with laptop, power bank and all standard USB outlets; Operating Voltage Range: 4V to 5.5V, Starting Voltage: 3.3V Size: 75x75x15 mm(2.95x2.95x0.59 in.); Air Intake: 50.6 mm/2 in.; Air Outlet: 45.5x15 mm(1.79x0.59 in.); Mounting Hole Pitch: 80 mm/3.15 in.