Made from fine silicone material and steel feel extra smooth and comfortable. Slap band design easy and convenient to use. It works very well in repelling mosquitoes and midges and has no side effects It smells good or okay for most of people. CE certificated product no healthy issue. Wearing two or more on wrist and ankle will offer more efficiency in outdoors. With fashion colors also can be a stylish sports wrist band. Suitable for outdoor camping hunting fishing farming and working at night etc. Usually it will last for approximately 15 days after you get it out of the its bag. Please keeping it in a sealed bag during the period you do not use it is the way to maintain its effects.