Important notes: 1. Automatic greenhouse ventilation equipment must not be used at temperatures above 50°C. 2. Make sure the greenhouse windows open properly. Specifications: Maximum window opening height approx. 45 cm. Full opening temperature approx. 30°C (depending on adjustment and load). Maximum weight must not exceed 7 kg. Opening temperature adjustment range 16 to 25°C. Note: When you receive this item in the summer, the black rod must be placed in the refrigerator for at least 5 minutes for the cylinder to fully retract before assembling this product. Color: Black and Silver. Material: Aluminum alloy. Package contents: 1 x Automatic window opener kit. This is only the package content; other products are not included. Note: Light reflections and different monitors may cause the color of the object in the picture to differ slightly from the actual object. The measurement may vary by +/- 1-3 cm.