Invented in 1986, the TESLAR technology was designed to emit a unique signal that strengthens the body’s own electromagnetic energy field and helps reinforce the body’s 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 overall improvement in well-being. Stainless steel case, 2 Swiss quartz movements, Black dial, Roman numerals, Scratch resistant, sapphire-coated mineral crystal, Stainless steel bezel, Stainless steel bracelet, Deployment clasp, 2 time zone displays, Teslar quantum technology, Water resistance : 30 meters/100 feet.