About this item DOUBLE-LAYER METAL CHAIN: Motorized Window Openers use double-layer metal chain design, which makes the operation more stable, with strong push-pull and locking force, 400N. HIGH-QUALITY PRODUCTS: highly polished, the shell is made of thickened aluminum, and the fashionable bright silver is more high-grade. The installation accessories are made of stainless steel, which is not rusted and durable. Crafted for you. OVERLOAD PROTECTION: The Chain Type Electric Window Opener is equipped with an overload protector. When the push-pull force reaches the peak value, the actuator will automatically cut off the power and stop the action. PROFESSIONAL DESIGN: Chain Linear Actuator opens or closes windows remotely via wall switch or remote control. After professional push-pull test, it can be switched on and off more than 10,000 times. It has the characteristics of low noise, low energy consumption and maintenance-free, creating a quiet and comfortable living environment for you. ANTI-THEFT AND HOME PROTECTION: When the Automatic Window Opener is closed, it automatically tightens the window to achieve the effect of locking the window. There is no need to install additional window lock handles. It is an indispensable housekeeping assistant in life.