Non Electric：Uses solar energy, open or close the greenhouse vents as temperature rises or drops.
Solar Energy：As the temperature changes automatically. The window opener maintains the best growing temperature and prevents your greenhouse from overheating.
Automatic Adjustment：The automatically adjusted temperature is 15 to 25°C. When the temperature exceeds 25 degrees, the window regulator will remain open. The temperature drops to 15-18 degrees Celsius and the opener will close completely.
Universal：Compatible with most greenhouse window openers with either single or double springs. also suitable for Orbesen, Gardman & B&Q vents.
IMPORTANT NOTICE: Do not use this opener anywhere the temperature will exceed 50° (122F).
