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✔️️Dual ball bearings Bearings 4010 Fan - High Speed version, More 5 x Air Guide Parts :)) ✔️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. ✔️️Rated voltage: DC 5V ✔️️Size: 40x40x10mm ✔️️Made by WINSINN