1、[Solar Powered] A heat-activated mechanical system that requires no batteries or electricity, using solar energy to open or close greenhouse vents as the temperature rises or falls. 2、[Automatic Temperature Control Sensor] Automatic temperature control sensor cylinders allow roof vents to open and close at the right time to ensure adequate air circulation. 3、[Durable Material] The greenhouse window opener is made of aluminum and stainless steel, making it durable and weather-resistant for long-lasting use. 4、[Quick Opening and Closing] The automatic vent opener quickly opens and closes the greenhouse window and can be attached or screwed to your greenhouse frame. 5、[Prevents Overheating] With automatic temperature changes, the ideal growing temperature is maintained, and the greenhouse is prevented from overheating. Item Type: Vent Opener Material: Aluminum Window Bracket Product Size: Approx. 33.5 x 4.5cm / 13.2 x 1.8in Temperature Sensitive Cylinder Product Size: Approx. 34cm / 13.4in Weight: Approx. 436g / 15.4oz Starts Opening: 25°C (77°F) Starts Closing: 15°C (60°F) Opening Temperature: 38°C / 100°F Maximum Opening Distance: Approx. 45cm / 18in Suitable Weight: Window or vent up to 7kg / 15lbs Applicable: Suitable for all and most greenhouses Package Includes: 1 x Cylinder 1 x Window Opener Bracket 1 x English Manual 8 x Screw 4 x Accessories