... space(cm2) <170Below horizon (degree)>35Maintance:1. The main mask dry cleaned with warm water, not in the sun insolation; 2 ... should be stored in a clean dry and the temperature right place, suitable temperature -20 °C ~ +45 °C, preservation period of 3 years ... wipe clean with alcohol, be placed in ventilated, dry, temperature 0 ~ 35 °C environment, not the use of fire baking, prolonged sun ...