Materials: Metal and plastic. Color: Black Dimensions: 33 x 1.5 x 1.5 cm 1. Fully automatic without power or battery 2.The cylinder of the automatic window opener automatically opens and closes the greenhouse windows when the temperature changes. 3. Automatic greenhouse window opener with temperature control and stepless adjustment of opening angle 4. By rotating the cylinder, the car window can automatically open, with a temperature range of 18 ° C to 25 ° C. Starting from 35 ° C, the cylinder of the automatic window opener is fully extended. 5. The temperature of the automatic window opener in the greenhouse can be controlled for optimal ventilation. 6. Provide perfect ventilation for plants through temperature controlled opening and closing. Attention: Do not use this discount anywhere with temperatures exceeding 50 ° C - please ensure that your greenhouse windows can open freely for at least 45 centimeters - please ensure that your greenhouse windows can open freely and are free of obstacles. The maximum weight of the ventilation window shall not exceed 7 kg - automatically set temperature from 15 bi