Features:_x000D__x000D_This is a replacement cylinder for automatic window opener. _x000D_High sensitive, automatic respond to weather changes, so you don't need to stay near the greenhouse. _x000D_Non electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops. _x000D_Great for most greenhouse to open or close window automatically. _x000D_Time and labor saving, also can supply a better temperature condition of plant's growth. _x000D__x000D_Specifications:_x000D_Condition: 100% Brand New_x000D_Material: ABS_x000D_Color: Black_x000D_Temperature Range: 20-25 / 68-77_x000D_Size: Approx. 33 x 1.5cm / 12.99 x 0.59in_x000D_Weight: Approx. 117g_x000D_Maximum Opening Distance: Approx. 45 cm / 18in_x000D_Adjustable Length: Approx. 33-45cm/ 13-18in_x000D_Application: For Under 14 Kg Window_x000D__x000D_Package Included:_x000D_1 x Window Opener Cylinder Only_x000D__x000D_Note:_x000D_1. Please allow 0-2cm error due to manual measurement. Thanks for your understanding._x000D_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._x000D_3. No battery or electricity required, need to be refrigerated before use. 1This is a replacement cylinder for automatic window opener 2High sensitive, automatic respond to weather changes, so you don't need to stay near the greenhouse 3Non electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops 4Great for most greenhouse to open or close window automatically 5Time and labor saving, also can supply a better temperature condition of plant's growth