The Soleus GPS Fit Watch has an easy to read display and simple user interface, making it a breeze to view real time running statistics when you're blasting around the block or taking off down the trail. This high sensitivity GPS receiver helps you set goals by tracking your speed, pace, and distance. It also tracks calories burned with your personalized data input for a highly accurate representation of how much energy you've expended. In addition, it charges and uploads data via an included USB to Soleus' Sync software. This free software can be easily downloaded online, and it works with both PC XP or newer and Mac OS 1. 6 Snow Leopard or newer.