WINSINN 40mm Fan 5V Dual Ball Bearing Brushless 4020 40x20mm Cooling High Speed Pack of 4Pcs

? Dual ball bearings - High Speed version ? High quality Dual ball bearings, More stable and Long life, suitable for continuous work. Use time can 24 hours / day. The life expectancy is about 60,000 hours. No maintenance required. But Lubricating oil can further reduce noise. ?Size: 40x40x20mm ?Rated voltage: DC 5V ?Line length: about 1.18in / 30mm --------------------------------------------------------------------------------------------------------------- Package include: ?4 x High Speed 4020 5V Dual ball bearings Fan --------------------------------------------------------------------------------------------------------------------- Product Warranty: -WINSINN are devoted to offer premium quality products to all cherished customers. Meanwhile supply 60 days money back guarantee and 24 months warranty. -If there are any questions, please feel free to contact us, WINSINN Customer Service Team will spare no efforts to assist with you within 24 hours.