This product is drug-free, fast work and easy to use. It's available when at work, play games, rest at home or any other places and time. (Not suggest to use while pregnant)It's also an award-winning and doctor-recommended product. Good for natural headache and tension relief, as well as insomnia and other physical discomfort caused by it. What's more, it has a certain therapeutic effect on mild colds, toothache, black circles of eyes, etc. The working principle of this product:Its main working principle is acupoint massage.This acupoint is called Hukou acupoint( LI4 acupressure point) in China. It is a very important acupoint for the body. Daily massage on Hukou acupoint can enhance body resistance, effectively treat headache, neuralgia, deafness, tinnitus, toothache, insomnia and whelk, etc.Specification:Material:SiliconeLength:5cm/1.97inFeature:Light weightNote:Please allow 1-3cm differences due to manual measurement, thanks.Please understand because of the light irradiation or computer display difference, so I can't guarantee photos and real color is 100% the same.Package Include:1 Pcs Wearable Acupressure Massager