Features: Made of quality material, durable and convenient to use. As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating. Non-electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops. Perfect for your greenhouse window. This products need to be refrigerated before use it. Specifications: Item Type: Greenhouse Winder Opener Cylinder Temperature range 15°- 25°/60°-77F Weight: Approx. 107g Package: 1 x Greenhouse Winder Opener Cylinder Notes: Do not use this opener cylinder anywhere the temperature will exceed 50° (122F). Do not dismantle the cylinder. This products need to be refrigerated before use it. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.