Designed and engineered utilizing the ultimate in cycling GPS technology, this is a must have device for serious riders.With a large, 2.7-inch 240x400 high-resolution screen with the option of vertical or horizontal viewing. It can simultaneously pair with Bluetooth Smart or ANT+™ enabled power meters, heart rate monitors and speed/cadence sensors, in addition to compatible electronic drivetrains. When paired with an iOS or Android handheld through the free Lezyne Ally V2 app, the device provides turn-by-turn navigation and phone notifications (incoming calls, texts and message app notifications). It has on-screen preloaded maps, provides turn-by-turn navigation, off-line navigation and can be instantly customized. Live tracking (Lezyne Track) can be activated in the app to let friends and family follow rides in real-time. Furthermore, the device is equipped with GPS/GLONASS, a barometer and an accelerometer. Combined, these greatly improve accuracy and data recording. It also has best-in-class battery runtime of up to 48 hours.