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. Easy to install and use.- Material: Metal and Plastic.- Made of premium material, very sturdy and durable.- 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- Portable and compact, very space saving.- Can be clamped onto or screwed onto your greenhouse frame.Notice:- Do not use this opener anywhere the temperature will exceed 50 C.- Please ensure your greenhouse window can be opened freely by at least 45cm.- Please make sure that your greenhouse windows can open freely and there are no obstacles.- The maximum weight of the ventilation window does not exceed 7 kg.Quantity shipped: 1 pieceProduct color: blackProduct size: about 33.5cm long