Important Notice: 1. Automatic greenhouse ventilation must not be used at temperatures above 50°C. 2. Make sure your greenhouse window opens normally. Specifications: Maximum window opening height about 45 cm. Full opening temperature about 30°C (depending on adjustment and load). Maximum weight no more than 7 kg, 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 Set Only the above package contents, 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 measurement allowed error is +/- 1-3 cm.