The touchscreen Garmin Edge 510 is designed for the competitive cyclist who seeks the most accurate & comprehensive ride data. This package contains two speed/cadence sensors (one for each of your bikes) so you can choose which bike you'll use for your ride without having to think about which bike has your Garmin speed/cadence sensor fitted as they'll both have one. The Edge 510offers connected features* through your smartphone, including live tracking, social media sharing & weather. Whether you're training, racing or touring, Edge 510 tracks the details of your ride, & you can view it later on a map at Garmin Connect Compatible with GPS & GLONASS satellites for faster satellite acquisition & enhanced signal lock the 510 is suited for the most challenging conditionssuch as forests & valleys.