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✔️Dual ball bearings 4010 Fan - 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 more than 60,000 hours. No maintenance required. But Lubricating oil can further reduce noise. ✔️️Rated voltage: DC 5V ✔️️Size: 40x40x10mm ✔️️️Made by WINSINN