Designed and engineered in-house utilizing the ultimate in cycling GPS technology, this is a must have device for serious riders. It has 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 our free Ally V2 smartphone app, the Mega XL GPS can display incoming texts, phone calls 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. All this and a whole lot more.