This Sector timepiece for men showcases a stainless steel case on a matching bracelet. It features a chronograph function, date display with tachymeter inner bezel, and is water resistant to 100 meters. Case: Stainless steel, round Caseback: Stainless steel, snap-down Bezel: Unidirectional rotating Dial: White Hands: Luminous hands Markers: Arabic numerals Subdials: Chronograph Calendar: Date display Bracelet: Stainless steel Clasp: Tang buckle Crystal: Mineral Crown: Screw-down Movement: Quartz Water resistance: 10 ATM/100 meters/330 feet Case measurements: 42 mm wide x 42 mm long x 12 mm thick Bracelet measurements: 21 mm wide x 8.5 inches long Model: R3273603145 All measurements are approximate and may vary slightly from the listed dimensions. Men's watch bands can be sized to fit 7.5-inch to 8.5-inch wrists. Click here to view our Watch Sizing Guide. A screw-down crown (knob) creates a water-resistant seal. To unscrew the crown, turn counter-clockwise and pull/push into position to set time, date, and other functions. To close the crown, press it against the case and turn clockwise.