Philip Stein Classic Square Womens Stainless Steel Watch - Metallic Silver Leather Band Natural Frequency Technology Philip Stein Watch 21-CMOP-cms The Philip Stein Natural Frequency Technology is delivered to wearers through a metal disk 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 (28 mm x 39 mm, 10 mm thick), Screw-in case-back with sapphire crystal window revealing the Natural Frequency Technology chip, Polished stainless steel bezel Mother of pearl dial with silver sunray center, Black luminescent hands, Shiny black Roman numerals and indices, 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 Metallic silver calfskin leather strap, Pin buckle