Important notes: 1. Automatic greenhouse ventilation systems cannot be used when the temperature exceeds 50°C (122°F). 2. Make sure your greenhouse windows can open properly. Specifications: Maximum window opening height is approximately 45 cm. The temperature when fully open is approximately 30°C (depending on adjustment and load). Maximum weight not exceeding 7 kg/15 lbs, opening temperature adjustment range is 16 to 25°C. Note: When you receive this product in summer, cool the black rod for at least 5 minutes so that the cylinder can be fully retracted before installing this product. Colors: Black and silver. Material: Aluminum alloy. Package contents: 1 x Automatic window opener. The above only includes the package contents and does not include other products. Note: Light reflection and different monitors may cause the color of the item in the picture to differ slightly from the actual product. The measurement tolerance is +/- 1-3 cm.