Charges in Sunlight or Indoors 180 Day Power Reserve Low Charge Indicator and Time Reset Advisory Push Button Safety Clasp Water Resistant to 100 Meters Date Second Hand Luminous hands and markers for night-time visibility Solid Titanium Case & Bracelet is 1/3 Lighter than Stainless and Nickel-Free so it's hypoallergenic Aprrox. Width of case, 38mm not including setting crown