For your first step in heart-rate-based training, this watch lets you safely exercise within your target zone. With a simple one-button start, it shows your heart rate on a large, easy-to-read display. Great for cross-training fitness enthusiasts, including swimmers. Includes a chest strap with a built-in heart-rate sensor. Brand: Polar Dial Color: Gray Strap: Black silicone Clasp: Buckle Movement: Quartz Water Resistance: 30m Case Width: 37mm Case Thickness: 10mm Bracelet Dimensions: 200mm long, 19mm wide Model No.: 90051024 Special Features: Stop watch; date and time display; alarm; coded transmission prevents interference from other training computers; summary of latest workout; records average and maximum heart rate; displays text in several languages Jewelry photos are enlarged to show detail.