AUTOMATIC OPENER DO GREENHOUSE WINDOW AUTOMAT Feature: Prevent overheating of the greenhouse. Ideal do greenhouse window — opens and closes the greenhouse window. Because the temperature changes automatically, it maintains the best growth temperature and prevents the greenhouse from overheating. Non-electric, uses solar energy, opens or closes the ventilation openings of the greenhouse when the temperature rises or falls. You can attach or screw do greenhouse frame. Specification: Set of do greenhouse window opening Material: aluminum alloy Fully adjustable from 20 - 25C (68 - 77F) Maximum window opening: 45 cm / 18 inches Maximum opening weight: 7kg/15lb Size: Approx. 38x9,5x5cm / 15,0x3,7x2,0 inches List of packages: 1 x set of do automatic window opening Do not use this opener in places where the temperature exceeds 50 (122F) Make sure that the greenhouse window can be opened freely by at least 45 cm (18") Do not place excessive strain on by blocking or obscuring the window Do not dismantle the cylinder The opener CANNOT stop manually! Monitors are not calibrated the same, the kolor of the items displayed in the photos may differ slightly from the actual object. Please take the real one as standard.