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1 it is a high-precision product, do not fall or crash. 2 do not expose the unit to strong magnetic objects, such as magnet and electrical motor. avoid strong radio waves. strong magnetic fields may cause the products breakdown or images and sounds damage. 3 never leave the products exposed to high temperatures and direct sunlight. 4 please choose branded micro sd card. neutral cards are not guaranteed to work normally. 5 do not place micro sd card near strong magnetic objects to avoid data loss