Easy to install, no need for drilling holes:This window seal for air conditioners can stop hot air by locking the hose between the window frame and the window itself. To keep your room more cool. Universal:Suitable for all commonly (air conditioner window, mobile air conditioning, portable air conditioners) used window types but unable use it on a Left and right sliding window or door Function:Prevents entry of hot air thereby increasing the efficiency of the air conditioner | Easy installation with Velcro strap High quality:This window seal is made of good quality material.resilient, water-repellent material, The zipper is smooth and the velcro is easy to use and strong. Convenient:You can open or close the window at any time without dismantling the Airlock