Important notice: 1. Automatic greenhouse ventilation cannot be used at temperatures above 50 (122 F)2. Make sure your greenhouse window opens normallySpecifications: Maximum window opening height approx. 45cmThe temperature for full opening approx. 30 (depending on adjustment and load)Maximum weight not more than 7kg/15lb, Opening temperature regulated 16 to 25NoteWhen 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 & SilverMaterial: aluminum alloyPackage contents:1 x Automatic window opener kitOnly 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 +/- 1-3cm.