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This automatic window opener from Tektake is a Temparature-controlled, fully automatic device that always ensures optimal ventilation in your greenhouse. No more wondering if you've accidentally left a window open on a cold night, or left it closed on a hot day. Thanks to the automatic window lifter, you can decide what Temparature range will open the window. The window opener doesn't require electricity or batteries, and can be attached to any standard window size with ease. Create the best conditions for your plants to grow with the automatic window opener from Tektake. Features: Automatic opening and closing depending on Temparature Perfect ventilation of greenhouses Suitable for all standard window sizes Infinitely adjustable opening angle by turning the cylinder Works without electricity or batteries Specifications: Dimensions: H:5.0 x W:5.0 x D:4.5 cm Colour: Silver Material: Steel Model Number: 402775 Self Assembly Required: Yes