Philip Stein Classic Square Ladies Stainless Steel Watch 21TB-FB-SS3 The Philip Stein Natural Frequency Technology is delivered to wearers through a metal disk inside the watch that was infused with key frequencies in a proprietary process. When worn, 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 (27 mm wide x 39 mm long, 10 mm thick), Screw-in case-back with sapphire crystal window revealing the Natural Frequency Technology chip Polished black stainless steel bezel, Black dial with sun ray design in 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, Brushed and polished stainless steel bracelet, Deployment clasp