TriPole Car Fan USB Powered - Powerful 3 Speed, Portable Cooling Clip Fan for Car Vent, Quiet Brushless Motor, 360 Degree Rotatable, Air Circulation for Vehicle, Van, Truck, SUV, RV. Quiet & Clip on Vents: This car vent fan is designed to run quietly and produces noise close to 30db, which will not disturb your sleeping.
eBay