Terawave terahertz blower is a Health Enhancement Device using Terahertz, Quantum and Optical Quartz Technology. Test results and testimonials show that when this Terawave device, terahertz therapy, is applied to the human body, it DOES SOMETHING amazing to the inside of the body, making the person feel so much better immediately or within hours. When applied to painful areas, for example, pain disappears; when applied to the chest, one feels the air pipes open up when breathing in and out. Based on the foregoing, and in general, this Terawave device, this SOMETHING, does wonders for the human body. Terahertz therapy has over 250,000 Google links/pages. This terawave instrument is safe for children as young as one year old and adults of any age. This terawave instrument is very easy to use. Simply blow on the areas that bother you. The length of the device is 12 inches. The weight without the cord is 10 ounces. Weight with cord is 1 lb. My testimony as a user and vendor of this terawave device: Lower back ache when I got out of bed in the morning. My knee cap used to hurt every now and then. So I utilized this terawave device to blow on my knee cap for 12 minutes and my back for 15 minutes, and both areas immediately felt better. I noticed no more pain in any spot after a few hours. There was no back soreness or knee cap pain when I awoke the next morning.