This is the latest and greatest GPS enabled device, it is smaller and simpler that anything Timex has made in the past. It is really a great products and is easy to use. With the Timex Ironman Run Trainer get real-time distance, pace, heart rate and more on a large, easy-to-read screen. * Distance, speed, pace and more in real time * 15-workout memory with dated summary * Free access to online training log * Desktop device agent allows for easy changes to watch and performance settings * 100-lap chronograph with customizable 3 or 4-line display * Pace, speed and distance alerts to keep your training on track * Hands-free chronograph operation based on distance or time * Hydration and nutrition alerts remind athletes to replenish at regular intervals * Five programmable interval timers with optional warm-up and cool down * Five customizable alarms with backup * Long-life rechargeable battery with 8-hour life in full GPS mode * Watch water-resistant to 50m (GPS and ANT+ features not available underwater) * Compatible with ANT+ sensor for heart rate and foot pod data Comes with Timex Flex-Tech™ Digital 2.4 Heart Rate Sensor