Simply place them on a wrist or ankle and keep bugs away for up to 72 hours. These mosquito repellent wristbands are waterproof, non-toxic, deet free and resealable. They come in a convenient pack of three and last for up to 200 hours. These bands are insecticide-free help to repel mosquitoes, flies, gnats and more. They provide an easy way to protect yourself from insects when you are constantly moving around.