This wireless heart rate watch needs a lithium primary battery to run and comes standard with a cardio connect plug-in for a variety of devices. Sportline Elite Cardio Connect Men"s Heart Rate Monitor plus GPS Watch with Strap, Black: * Heart rate monitoring with a coded chest strap * Speed and distance tracking * Calorie monitoring * GPS mapping * Altitude tracking * History tracking * Sharing (Facebook, Twitter, etc.) through Runtastic App (included) * Cardio Connect plug-in (iPhone, Droid, BB, Windows 7) * Dimensions: 8.75"L x 6"W x 2.75"H * Battery type: lithium primary * Model# SB1089BK * 5-year warranty