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◆Please note that the back battery cover need the Screwdriver to open it,but the package doesn't come with the screwdriver. ◆Products made by diameter of 0.4MM optical fiber, optical fiber is environmentally friendly materials. ◆Electronic components and shells are fragile, avoiding beating, rejection, put down gently ◆To avoid high temperature exposure◆Because the fiber is a plastic fiber, high temperature easy to make fiber optic cable deformation and affect the appearance of the product. Suitable for the temperature of -10 degrees to 30 degrees. ◆Remove the battery while nonuse◆ In order to avoid the battery power consumption, but also easy to cause corrosion of batteries, rust.