[Effective and practical] This auto thermo can effectively prevent the greenhouse from overheating, which is very practical. [Prevent greenhouse from overheating] With the automatic temperature change, it can maintain the optimal growth temperature and prevent the greenhouse from overheating. [Energy saving] Non-electricity, using solar energy, as the temperature rises or falls, open or close the greenhouse vents. [Strong flexibility] It can be clamped or screwed on the greenhouse frame, which is flexible in use. [Application] It is an ideal choice for greenhouse windows, open and close greenhouse windows.