Building from the legacy of CatEye's massively popular Strada Slim computer, the CatEye Strada Smart Package Bike Computer takes the Slim's thin profile and large screen, adds Bluetooth functionality for communication with your smartphone, and bundles a wireless cadencespeed sensor. Mirror mode provides the option of pairing it with your smartphone for functionality with popular cycling apps, while Sensor Direct relies solely on the included cadencespeed sensor. Using Mirror mode, the CatEye Strada Smart wirelessly communicates with the CatEye Cycling App or Strava via Bluetooth. It's available for both iPhones and Android devices check on CatEye's site for recommended devicescompatibility. Mirror mode records ride savvy metrics with your smartphone's CatEye App, wirelessly transmitting data to the Strada Smart's display for real time tracking. Watch your cadence, speed, and altitude via your phone's GPS in real time. You'll also receive email and phone notification icons, as well as a post ride map and graph summary for in depth analysis. As a battery saving bonus, your phone remains in sleep mode during its tracking efforts to prevent it from dying mid ride. Sensor Direct mode works without a smartphone, pairing exclusively with the included cadencespeed sensor, as well as optional heart rate monitor and power sensor both sold separately. This mode tracks your speed, cadence, heart rate with separate monitor, and power output with separate meter. It also provides a ride summary with a date stamp, elapsed time, and overall trip distance. Moreover, average and maximum values are provided for all of your riding stats in both Mirror and Sensor Direct modes.