Features:

• Ideal for your greenhouse window--opens and closes your greenhouse window.
• 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.
• Can be clamped onto or screwed onto your greenhouse frame.

Specifications:
Greenhouse Window Opener Kit 
Maximum window opening 45cm
Maximum opening about 30°, depending on adjustment and load
Maximum opening weight 7kg/15lb
Adjustable open temperature range 15°- 25°/60°-77F

Package:
1x Automatic Window Opener Kit 

Notes:

• Do not use this opener anywhere the temperature will exceed 50° (122F)
• Please ensure your greenhouse window can be opened freely by at least 45cm (18")
• Do not apply excessive loads by locking or covering window
• Do not dismantle the cylinder
• The opener CANNOT stop by manual
• 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.