Introducing the latest POWER TRAINER additions to the GBA900 Series of Smartphone Link timepieces. This model can measure distance using an accelerometer while linked with the GPS function of a smartphone via Bluetooth(R). Once you take measurements with a smartphone, the next time you will be able to measure distance with the watch alone.Distance and running time measurements are used to calculate your pace, and an auto lap feature automatically records the time it takes to cover a specific distance. You can also check your activity history by linking with an app running on your smartphone. The app also helps to simplify the configuration of watch settings and training management. Analog-digi quartzWhite resin bandSize of case: 51.348.916.6mmWater-resistant: 200mLED light for the face (Auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)LED backlight for the digital display (Auto LED light, Super illuminator, selectable illumination duration (1.5 seconds