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 (27 mm wide x 39 mm long, 10 mm thick), Screw-in caseback with sapphire crystal window, Polished black stainless steel bezel, Black dial with textured center, Silvertone luminescent hands, Silvertone Arabic numerals, Small seconds subdial at the 6 o'clock position, Sapphire coated mineral crystal, Swiss quartz movement, Water resistant to 3 ATM/30 meters/99 feet, Black silicone rubber strap, Pin buckle, Model number: 21TB-FB-RB. Design: Holidays Style: Casual Occasion: Birthday Adjustable: Yes Shape: Rectangular Material: Stainless Steel Dial Color: Black Movement: Quartz