Important Notice: 1. Automatic greenhouse ventilation cannot be used at temperatures above 50°C (122°F) 2. Make sure your greenhouse window opens normally Specifications: Maximum height of window opening about 45cm Temperature of full opening about 30°C (depending on adjustment and load) Maximum weight no 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 no less than 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 The above package content only, 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 the actual item. The allowable measurement error is +/- 1-3 cm.