Forerunner 10 is so easy to use; you can start your run with the press of a button. As you run you can see your time and distance clearly displayed on 1 screen and calories and pace on another. You can also customize the settings to show pace and distance on the same screen. It's Garmin's lightest, most comfortable watch yet and is available in black with silver accents. All models can be worn as a regular watch, so your running partner is always on hand. For typical use (with GPS on 30 minutes per day), the battery life is 10 days. If used continuously with GPS, the battery life is 5 hours.