Easy Setup with Video: Step by step video guide, easy calibration, includes 2 long screws for metal frames Maximum Thrust of 15 Pounds: Powerful spring and cylinder design, easy to open and close heavy-duty ventilation windows High Strength Aluminum Alloy: Made of strong aluminum alloy, superior durability for stable, long term use Solar Powered Automatic: No electricity needed, heat activated, prevents overheating freezing automatically Universal Fit for Greenhouses: Fits most greenhouse types, auto regulates temperature, your smart gardening helper ASIN B0GXW6887K Item Weight 1.6 pounds Manufacturer yisanxunshi Item model number wl-yq-wk-06 Product Dimensions 13 x 2 x 1.5 inches