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To install, unscrew the battery compartment cover located near the objective lens. Insert the positive end of the battery into the battery compartment leaving the negative end facing out. Replace the battery cover carefully – do not over tighten. Use and Testing This device operates on one 3-volt CR123 lithium battery. Make sure it has been installed according to the instructions above. If you wish to test your night vision device in a lighted area, be sure the objective lens cap is covering the