USB Itching Removal Instrument is a new generation of high-tech product. It is integrated with electronic and optical spectrum technology. It doesn't have any chemicals to restrain or kill bacteria and viruses rapidly. Moreover, it doesn't have any toxic reaction or adverse effect to the human body. If you use this product after bite by insects such as mosquito, bee, flea, louse etc., the tumescence will be eliminated in a short time so as to avoid chafing. Suitable for home, travel and field work etc. all kinds of people use.