This GPS-enabled sport watch tracks your training, then wirelessly sends your data to your computer. The ultimate in training technology, its sleek design features a touch bezel that lets you quickly scroll and select features on the run. Its unique design gives the GPS antenna a better view of the sky, so it can get a stronger signal during your run. And its high-sensitivity GPS receiver provides improved tracking under trees and near tall buildings. Continuously monitors your time, distance, pace, calories, heart rate (when paired with included heart rate monitor), and bike speed/cadence (with optional sensor, not included). Forerunner 405CX has superior calorie measurement, better GPS sensitivity and alternative webbing for smaller wrists that make the watch much more suitable as a ladies sports watch. Also includes the wireless heart rate monitor.