D LINE ANALOG Big Al · Stan · Ron Battery SR721W Silver Oxide battery Battery Life: The battery in your Nike watch is estimated to last 2 years, depending on frequency and use of certain features. Battery Replacement: Battery replacement must be performed by a certified Nike service center to retain a valid warranty. In addition to battery replacement, the service center will test movement, gaskets, water resilience and hardware, to further ensure the long-term care of your watch. Warning! Keep watch batteries away from children. If swallowed, contact a doctor immediately. Warning! Batteries contain chemical substances. They should be disposed of properly according to local regulations. Material Specifications Crystal: Mineral Links: Stainless Steel, Aluminum or Titanium Strap: Polyurethane Case: Polycarbonate Battery Hatch: Stainless Steel Buckle: Stainless Steel Operating Temperature -5 to 50° Celsius Water Details 100m water resistance Mode Limits Chronograph: 99'59" This document with updates is available online at www.niketiming.com ...