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. 45cm Full opening temperature approx. 30°C (depending on adjustment and load) Maximum weight not more than 7kg/15lb, 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 fully retract the cylinder before assembling this product. Color: black and 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 +/- 1-3cm.