Fangrui Product Details Fangrui Product Details Friction-driven Without Track Required: The Window Is Driven By The Silicone Drive Wheel Of The Window Pusher, And The Maximum Push Force Is 50n, Which Can Easily Realize The Window Automation. Timed Opening For Ventilation: For The Indoor Air Circulation, Timely Opening Of The Window Is Necessary, The Timing Function Of The Window Push Completely Free Your Hands, Protect The Health Of Your Family. Accurate Percentage Control: On The App, You Can Not Only Choose To Open Or Close The Window, But Also Adjust The Window Open/closed Ratio To Meet Your Needs. Smart Linkage: Smart Linkage Helps You Unlock Different Ways To Use, When Linked With The Temperature And Humidity Sensor, If It Detects That The Indoor Temperature And Humidity Are Too High, The Linked Window Pusher Open The Window Timely To Ventilate And Cool Down In Time. Left/right Installation Allowed: Suitable For Different Window Opening Directions, The Installation Of Different Directions Can Be Set On The App. The Flexible Adjustment Helps Use E