Timex Bodylink Speed, Pace, Distance and Navigation Functions in a Single Wrist Instrument. Customizable Display with upto 4 Screen views. Performance and Multisport Modes for Training and Event use. Built for Ironman Competition. Downloadable / Rechargeable. It's no longer enough to train hard; you also have to train smart if you want an edge. Enter the Timex Ironman Global Trainer speed and distance watch, which gives elite athletes the performance tools they need to succeed. The Global Trainer is equipped with a SiRFstar III GPS chip, which records your performance across several dimensions and displays the data on a customizable screen. With the Global Trainer, you can easily monitor your pace, speed, distance, elapsed time, and calories burned, helping you determine how much you've improved during your training period. The watch also includes a 20-workout memory with dated summaries. As a result, athletes can record up to 1,000 laps of information and then download the data to TrainingPeaks.com, a free online training log site. Or you can challenge yourself the old-fashioned way using the integrated count-up and countdown timers, which help you measure your interval performance. The watch even includes a Performance Pacer to help you meet your finish-time goals. Features and Specifications: Modes: 6 OS requirements: Windows XP or newer, or Mac OS X 10.6 (Snow Leopard) or newer Battery charging options: USB or AC outlet Heart rate sensor compatibility: Timex digital 2.4 heart rate sensors using ANT+ Bike power compatibility: 3rd-party sensors using ANT+ Language support: English, Spanish, Portuguese, French, German, and Italian Night light: Indiglo, with night mode Case: Lightweight resin Strap: Resin Water-resistant: Yes, to 50 meters.