Metallic gray terahertz square bracelet. ● Used, in excellent condition No noticeable scratches or damage. Inner circumference approximately 17cm It is connected with elastic string, so it has elasticity. - Color: Metallic gray - Terahertz - Design: Bracelet, square links Thank you for viewing. Terahertz (THz) is a unit of frequency that vibrates 1 trillion times per second (1THz = 1 trillion Hz), and refers to the electromagnetic wave in that frequency band, "terahertz wave." Terahertz waves have properties intermediate between "radio waves" and "light (infrared rays)," and are expected to be applied in a wide range of fields such as next-generation communication, medicine, and security due to their ability to penetrate materials and interact with biomolecules. Also, as "terahertz ore," high-purity silicon products artificially made are distributed as health goods, and are said to have cell activation and blood circulation promotion effects. Main features of terahertz waves Frequency and wavelength: 1THz is 1 trillion Hz. The wavelength is about 300 micrometers (0.3mm), located between radio waves and light. Material permeability: It easily penetrates paper, cloth, plastic, wood, etc., and allows you to see the contents like an X-ray inspection, but it has lower energy than X-rays and is safe. Interaction with biomolecules: Because it matches the natural frequency of biomolecules such as proteins, it can excite (activate) specific molecules and acquire their information. Properties: It has both the properties of "passing through materials" of radio waves and the properties of "traveling in a straight line" of light. Application fields of terahertz waves Communication: Research on application to ultra-high-speed, large-capacity next-generation mobile communication (6G and beyond) is progressing. Medical and health: Effects on cell activation, blood flow improvement, cancer, Alzheimer's disease, etc. are expected, and it is used in research and health goods (terahertz ore products). Security: Used for inspection (transmission image analysis) of explosives and drugs hidden under clothing. Other: Observation of planet formation (radio astronomy), analysis of polymer materials, etc. What is terahertz ore? Composition: An artificial ore made by refining and recrystallizing silicon (Si) to high purity, and is a member of the quartz family. Effects and expectations: It emits terahertz waves, and cell activation, blood circulation promotion, relief of coldness, relaxation effects, etc. are expected, and it is popular as an accessory.