Keep away aedes and malaria mozzies, sand flies and other nasty insects for an amazing 18 Hours. 100% Citronella 72 hours Effective duration 25mm diameter Patch Size 120G Non-Woven Fiber 3 Years Shelf Life How to use: Take out the patch from the pouch. Remove the protection film. Attach the sticky side to you clothes or somewhere close to the body. You can stick it to the inside of you clothes or even at the adge of a table or bad.