Noted: There are no any Button Control for our products..【Stable & Durable Exhaust Fan】: The ventilation fan is made of high-quality metal materials, with a bright surface, anti-corrosion, anti-scratch and prevent inhalation of foreign objects. Compared with other competitors' products, it can withstand moisture and high temperature, provide a stable working environment for the ventilation fan, and longer life of the ventilation fan..【EFFICIENT VENTILATION FAN】 - Adopts double ball bearing outer rotor brush-less motor to ensure high efficient, quiet operation and high-quality performance. Compared with ordinary motors, the upgraded motor can reduce friction coefficient, save electricity effectively and enlarge the service life of the machine..【EASY TO INSTALL】- Suitable for wall or ceiling installation. The exhaust fan is recommended to fix with glue or screws.Convenient to clean, you can remove the motor by unscrewing the four-corner screws. The detachable design is convenient for cleaning up fragment or greasy dirt regularly for increasing service life..【Widely used wall ceiling ventilation fan】It is an ideal choice for creating efficient indoor HVAC system among workshops, basements, warehouses, apartment, kitchen, bathroom and other areas that require continuous or regular ventilation.High power bathroom exhaust fan can remove exhaust gas and ventilation with quickly and quiet way..【100% after-sales service】For All customers, this product comes with Lifelong Technical Support & 24 hours Premium Service. If you have any issues about the ventilation fan, please contact us first, we will give you the satisfied solution as soon as possible.