NIKE+ SportWatch GPS Powered by Tomtom (Certified Refurbished) This Certified Refurbished product is factory refurbished, shows limited or no wear, and includes a 90-day warranty Water resistant Nike+ SportWatch features TomTom GPS for accurate speed and distance information, indoors or out--even if the GPS signal gets interrupted Track your time, distance, pace, heart rate (with optional sensor), and calories burned; view your mapped route with pace data/changes in elevation on Nikeplus.com Rechargeable lithium polymer battery charges via USB, provides eight hours of run time with the GPS and sensor both turned on, up to 50 days of standby power Personal coaching features help keep you at your best--reminds you to run, stores your run history, and remembers your personal records