Loaded with serious training features, Forerunner 405CX continuously records your time, distance, pace, calories burned and heart rate. Each workout is stored in memory so you can review and analyze the data to see how you've improved. And advanced training features will challenge you to step up your pace race against Forerunner's Virtual Partner to improve your times, or set up interval workouts without having to circle the track. You can even download recorded courses to compete against previous workouts. To use the watch, simply tap the touch bezel to change screens without fumbling for a button. Self-contained GPS receiver, compact one-piece design Advanced heart rate based calorie consumption Tracks distance, pace, calories burned, and heart rate Tracks speed, distance, and pace indoors with optional foot pod Cycling cadence, speed, and distance with optional GSC10 cycle speed/cadence sensor Basic navigation: Mark and save up to 100 locations, then navigate to stored locations Customizable screens can show training time, pace, distance, lap pace, lap time, lap distance, average pace, elevation, calories burned, and much more Lap History: Automatically records up to 1000 laps; stores approximately two years of data. Can be downloaded to PC using included software Time of day clock with dual time zones, calendar, and alarm Automatic wireless data download to PC or web with included ANT stick interface Download recorded courses and compete against previous workouts Auto Pause: Automatically pauses training timer when pace falls below a preset point Auto Lap: Automatically triggers a lap when you reach a specified distance or location. Run anywhere and still get accurate performace data! Advanced Workouts: Set up workouts with specific durations and targets Simple Workouts: Setup up workouts based on time, distance, and calories burned Virtual Partner: Displays an animated training partner who will run at the set pace, so you can see if you are keeping up or falling behind. Adjust your pace as you run to stay motivated. Interval Training: Allows you to set up exercise and rest intervals based on time or distance, plus number of reps Size in inches: 1.88w x 2.78l x .65t - Weight: 62 grams Rechargeable Lithium battery with included charger - lasts 2 weeks in power saver, 8 hours with GPS on Includes: Forerunner 405CX watch, heart rate transmitter, AC adapter, charging clamp, USB ANT stick, and owner's manual Includes 2nd hook and loop wrist strap for extra large or small wrists One year warranty.