Color sent by random.
1, how to use: placed the nearest site where the skin is exposed edge of cuffs, shoelace, visor of cap or hat, pocket , backpack, wear and simplify.
2, Two or more and is more efficient when worn, the lasting effect is 2-3months,
3, When not use, please store it in zippered bag.
4, when unused, stored in a zipper bag then you can also(still) use it for more than a year.