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 window opening height approx. 45 cm. Temperature for full opening approx. 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 summer, you must put the black rod in the refrigerator for at least 5 minutes to get the cylinder fully retracted before assembling 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 a little different from the real thing. The allowed measurement error is +/- 1-3 cm.