German Lenze coaxial helical gear reducer with enlarged frame size (output diameter 40mm) -- reduce the risk of radial force, one of the safety guarantees.Shell brand Omala S4 super long life synthetic gear oil, 20,000 hours maintenance free -- improve the quality of oil products, one of the safety guarantee. Germany's top imported Simrit output double oil seal design - reduce the possibility of oil leakage seal, long-term quality assurance. Box automatic exhaust valve - reduce the risk of oil emulsification, one of the safety guarantees. Original Julai Eld German Motor CeilingHvlsFan enhanced roller bearing - reduced radial offset, lifetime warranty.