Known as the "Feel Good Watch" Philip Stein watches utilize Natural Frequency Technology to help balance the body's energy flow and promote an improved sense of well-being. Quartz movement Purple rubber strap Thorn buckle clasp Stainless steel bezel and case Mineral crystal Design details: Inside of each Philip Stein watch is a metal disc that functions as a fine-tuned antenna, channeling nature's beneficial frequencies which encourage the human body's optimum performance, including more energy, focus, and overall well-being. Case: 36mm in diameter Manufacturer's limited warranty