PREVENT HOT AIR INCOMES-XIAOYI window seal keeps the warm air coming from the hose of your portable air conditioner away by locking the hose between the window frame and the window itself. Our window seal leaves out insects, mosquitoes, rain and crates a "closed environment" that keeps your room cool for longer. LET YOUR ROOM COOL DOWN QUICKLY-Enjoy a cooler environment in summer thanks to Xiaoyi!Xiaoyi seals around your open window and then zips around the nozzle of your hose and blocks the return flow of warm air, so that your mobile air conditioning unit can be more efficient and cools your room in less time. REDUCE ENERGY CONSUMPTION - Xiaoyi loves the Earth! This window seal contributes to reduce energy consumption and to lower carbon dioxide emissions, which is particularly high in summer due to the massive use of air conditioning. Preventing warm air circulating in your room, Xiaoyi window seal helps you save money on electrical bills! EASY TO INSTALL- no need for drilling holes. You don't have to buy window kits, adapters for your hose or additional tools. There are 300cm/400 cm/560cm window perimeter,you can choose . Suitable for all mobile air conditioners units and tumble dryer regardless of manufacturer. but unable use it on a Left and right sliding window or door.The window remains fully functional and can be closed and opened as usual. And the window seal is water resistant and washable