... 3. The newest product Greenhouse automatic window opener/vent opener, greenhouse window opener/vent opener, window opener/opener Three StylesItemPictureT-312 T ... .Heat activated3.Fully adjustable to open between 15-25 C (60-77 F)4.Open window fully to 350mm5.Suitable for ... provided7.No batteries or electricity required8. With the automatic window openers, you can be sure of an even temperature ...