Important Notice: 1. Automatic greenhouse vents should not be used in temperatures exceeding 50°C. 2. Please ensure your greenhouse window can be opened normally. Specifications: Maximum window opening height approx. 45cm. Temperature for full opening approx. 30°C (depending on adjustment and load). Maximum weight not exceeding 7kg, opening temperature regulated 16 to 25°C. Note: When you receive this item in summer, you need to put the black rod in the refrigerator for at least 5 minutes to allow the cylinder to fully retract before installing this product. Colour: 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 be slightly different from the real one. The allowable measurement error is +/- 1-3 cm.