Important Notice: 1. Automatic ventilation of greenhouse can not be used at temperatures above 50 (122 F) 2. Make that your greenhouse window opens normally Specifications: Maximum height of the window opening about 45cm The temperature of complete opening about 30 (depending on adjustment and load) Maximum weight not more than 7kg or 15lb, Opening temperature regulated 16 to 25 Note When you receive this item in summer, you need to put the black bar into the refrigerator not less than 5 minutes to make the cylinder retracted fully before you assembly this product. Color: Black and Silver Material: aluminium 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 measurement allowed error is 1-3cm.