Invented in 1986, the TESLAR technology was designed to emit a unique signal that strengthens the bodys own electromagnetic energy field and helps reinforce the bodys energy field to better resist the potential negative effects of external, low-energy electromagnetic fields (EMF) given off by cell-phone systems, computers and many other electronic devices. As a result of the TESLAR Effect, past wearers have experienced : Deeper, more restful sleep; More calm and less tension; Improved concentration; Increased levels of energy; An over-all improvement in well-being. Stainless Steel Case, 2 Swiss Quartz Movements, Mother of Pearl Dial, Arabic Numerals, Scratch Resistant, Sapphire-coated Mineral Crystal, Stainless Steel Bezel, Black Alligator Strap, Pin Buckle, 2 Time Zone Displays, Teslar Quantum Technology, Water Resistance : 30 Meters/100 Feet, Case Dimensions : 41mm x 19mm, 9.5 mm Thick, Strap Dimensions : 12mm Wide, 8 Inches Long