The Philip Stein Natural Frequency Technology is delivered to wearers through a metal disk inside the watch that has been infused with key frequencies in a proprietary process. When worn on the wrist, the watch exposes frequencies to the biofield - which is the master energy field that regulates the body's functions - and informs the body to relax and become more resistant to stress. Studies have shown, better sleep, less stress, clearer focus and better concentration, for wearers of Philip Stein watches. . . . . . . . . . . . . . . . . Brushed stainless steel case (36 mm in diameter, 8 mm thick), Screw-in case-back with sapphire crystal window, Polished stainless steel bezel, Fasion black dial with guilloche center, Silver-tone luminescent hands, Silver-tone Arabic numerals, Small seconds sub-dial at the 6 o'clock position, Sapphire coated mineral crystal, Swiss quartz movement, Water resistant to 3 ATM/30 meters/99 feet, Black satin leather strap, Pin buckle, Model number: 41-FB-IB.