Replacement cylinder for automatic window opener. High sensitivity, automatic response to climate changes, so you don't have to be near the greenhouse. Non-electric, uses solar energy and opens or closes the greenhouse vents when the temperature rises or falls. The automatic window opener is ideal for most greenhouses to automatically open or close the window. Saving time and labor can also lead to better temperature conditions for plant growth. Features: 1. This is a replacement cylinder for the automatic window opener. 2. High sensitivity, automatic response to weather changes, so you don't have to be near the greenhouse. 3. Non-electric, uses solar energy, opens or closes the greenhouse vents when the temperature rises or falls. 4. The automatic window opener is ideal for most greenhouses to automatically open or close the window. 5. Saving time and labor can also lead to better temperature conditions for plant growth. Condition: 100% Brand New Material: ABS Color: Black Temperature Range: 20~25℉/68~77℉ Size: Approx. 33*1.5cm/12.99*0.59inch Package Included: 1 x Window Opening Cylinder Only Note: 1. Please allow 0-2cm error due to manual measurement. Thanks for your understanding. 2. 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.