The metal disc in the Zone Bracelet is equipped with a minute electromagnetic field. This electromagnetic field supports frequency tuning to help maintain the best balance of mind and body depending on the purpose. By wearing the Zone Bracelet, you can synchronize your brainwaves with the Earth's second resonant frequency, allowing you to achieve zone-like performance anytime. 【Effects】Controls stress levels, enhances concentration, and brings out zone-like performance. 【Situations for Wear】Presentations, times when you want to concentrate, during work, and during sports such as golf and tennis. - Brand: PHILIP STEIN - Model Name: Zone Bracelet - Strap Size: Length 205mm, Width 12mm - Head Size: Diameter 23mm, Thickness 5mm - Features: Perpetual, resistant to sweat, lightweight and comfortable to wear, no charging required. Box not included. Thank you for viewing. We will ship with simple packaging, so please purchase only if you understand.