Important notice: 1. Automatic greenhouse ventilation must not be used at temperatures above 50°C (122°F). 2. Ensure your greenhouse window opens normally. Specifications: Maximum opening height approximately 45 cm. Temperature for full opening approximately 30°C (depending on adjustment and load). Maximum weight not more than 7 kg/15 lb, opening temperature regulated 16 to 25°C. Note: When you receive this item in the summer, you must place the black rod in the refrigerator for at least 5 minutes for the cylinder to fully retract before installing this product. Color: Black & Silver Material: Aluminum alloy Package contents: 1 x Automatic window opener kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.