Automatic window opener for heat-sensitive solar greenhouses, automatic ventilation opener

Features:1.Perfect for your greenhouse window - opens and closes your greenhouse window
2.As the temperature changes automatically, it maintains the best growing temperature and prevents your greenhouse from overheating.
3.Non-electric, uses solar power, opens or closes the greenhouse vents as the temperature rises or falls
4.Can be attached or screwed onto your greenhouse frame
5. Please ensure your greenhouse window can be opened freely at least 45 cm (18").
Specifications:Features:
Perfect for your greenhouse window - opens and closes your greenhouse window.
As the temperature changes automatically, it maintains the best growing temperature and prevents your greenhouse from overheating.
Non-electric, uses solar power, opens or closes the greenhouse vents as the temperature rises or falls.Please take the real one as standard.