Description of the product function: The manual control of the roof ventilation exchanges the air in your motorhome or caravan within minutes. It removes cooking smoke and unpleasant aromas from the bathroom and lets you breathe fresh outside air. Breathe in natural, fresh outside air to make your living space more comfortable. NOTE: Installation instructions are NOT included Professional installation is highly recommended It is recommended to use a neutral structural glue for installation to avoid the bad combination of acidic and alkaline glue which can lead to bad chemical reactions like corrosion and glue cracks. Roof Vent Fan Camper Van Motorhome RV Caravan Skylight Vent 28x28cm w/LED Light. Photic: Yeah Adjustable speed: no Touch Control Panel: No. France, Germany, spain, Italy. Feedback is very important to us. It is impossible to address issues if we do not know about them! Please keep the original box or packaging within 15days since item received. Your satisfaction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it’s non-workdays, please kindly be patient and wait till Monday.