Great for charging and transferring data Connect the cable to your computer's USB port Pairs with an optional AC adapter (sold separately) Complete 2 tasks with 1 cable using Garmin's Forerunner 10/15 Charging/Data Clip (Large). Connect the cable to your computer's USB port to recharge your Forerunner and to transfer data to and from your computer. This cable also pairs with an optional AC adapter (sold separately).