Features: C80:Collecting real time speed from GPS satellitesDriving time and distance calculation and displayPower through vehicle cigarette outlet jack, no professional installation is requiredDisplay MPH or km/h to Simple push button set upAuto adjust brightness through sensor for day and nighttotime drivingOvertospeed warning: 3tosecond alarm beep and display flash will warn driver 93 beeps for over speeding alert)Universal: compatible with all cars, trucks, bikes, and motorcycles.(Note: when using with the bicycle, pls use the usb cable connecting with a powerbank.) C60s:One time driving time and distance calculate and displayPower through Vehicle Cigarette Outlet Jack, No professional installation is required.Use GPS Signal Guided Calculation, No wiring needed to the VSS (vehicle speed signal).Display MPH or km/h to Simple Push Button Set up.Auto Adjust Brightness thru Sensor for Day and nighttotime Driving.Over Speed Warning Setting to Alarm Mute Function.Overtospeed warning: a 3seconds alarm beep and keep flash display will keep warning driver.NoteC80 with Altitude, time, total mileage function C60s without these functions Package Included:1 x Car HUD Head Up Display Do drop