Rider 21 is designed for your daily exercise. Rider 21 records rich exercise data without installation required. Rider 21 is equipped with GPS to record your tracks, laps, speed, distance and calories burned.Features:*3 customised data screens with various data options, such as distance, calories, speed, altitude, slope and more.*Real time altitude information to help you ride smartly.*Compatible with ANT+ HR monitor, speed and cadence sensors.*Slim and lightweight design.*Anti-glare display for daytime and clear backlight for night rides.*No installation needed. Just turn on and go.*Upload exercise data to brytonsport.com for detailed analysis.What"s in the box:*Rider 21 main unit*4 pins connector cable*Bike Mount*Document Kits