??High Speed - Dual ball bearings 5015 Blower Fan - Line Length 1 Meter ??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.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 24V ??Size: 50*50*15mm ??Made by WINSINN