Specifications: Condition: 100% Brand New Material: ABS Color: Black Temperature Range: 20-25℃ / 68-77℉ Size: Approx. 33 x 1.5cm / 12.99 x 0.59in Weight: Approx. 117gMaximum Opening Distance: Approx. 45 cm / 18inAdjustable Length: Approx. 33-45cm/ 13-18in Application: For Under 14 Kg Window Package Included: 1 x Window Opener 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.3. No battery or electricity required, need to be refrigerated before use. Features High Sensitivity: Our window opening sensor can automatically respond to weather changes, so you don't need to stay near the greenhouse. Solar Energy: Non-electric, this window opener cylinder uses solar energy, opens or closes the greenhouse vents when the temperature rises or falls. Universal: The automatic window opener is compatible with most greenhouse window openers with single or double springs. Easy to Use: This kind of automatic window sensor opener saves time and labor, also can provide better temperature condition for plant growth. Accessories: This window opening temperature sensor is a replacement cylinder for automatic window opening.