Important Notice: Automatic ventilation of the greenhouse cannot be used at temperatures above 50C (122F). Ensure that your greenhouse window opens normally. Specifications: Maximum height of the window opening: approximately 45 cm. Temperature for complete opening: around 30C (depending on adjustment and load). Maximum weight: not more than 7 kg (15 lb). Opening temperature regulated between 16C and 25C. Note: When you receive this item in summer, place the black bar in the refrigerator for at least 5 minutes to allow the cylinder to retract fully before assembly. Color: Black & Silver Material: Aluminium alloy Package Contents: 1 x Automatic Window Opener Kit (Note: Only the above package content is included; other products are not included.) Additional Notes: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the actual product. Measurement error allowed: +/- 1-3 cm.