The Garmin Edge 820 GPS Bike Cycling Computer features advanced performance analysis, robust connectivity, turn-by-turn navigation and alerts to your emergency contact in the event of an accident. The Edge 820 features a 2.3" color touchscreen with 200 x 265 screen resolution which can operate with gloves on and designed for avid riders who want to take their training to the next level. The touchscreen features an ambient light sensor, which adjusts the screen's brightness to suit light conditions. The Edge 820 is compatible with ANT+ sensors measuring speed, cadence and heart rate. The Edge 820 has safety and security features include group messaging and tracking, when paired with your smartphone. It has a rechargeable battery which lasts up to 20 hours on a full charge. It has an IPX7 water-resistance rating and will withstand splashes and rain.