Features: C80:Collecting real time speed from GPS satellitesDriving time and distance calculation and displayPower through vehicle cigarette outlet jack, no profeional installation is requiredDisplay MPH or KM/h - Simple push button set upAuto adjust brightne through sensor for day & night-time drivingOver-speed warning: 3-second alarm beep and display flash will warn driver 93 beeps for over speeding alert)Universal: compatible with all cars, trucks, bikes, & 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 profeional installation is required.Use GPS Signal Guided Calculation, No wiring needed to the VSS (vehicle speed signal).Display MPH or KM/h - Simple Push Button Set up.Auto Adjust Brightne thru Sensor for Day & night-time Driving.Over Speed Warning Setting -- Alarm Mute Function.Over-speed warning: a 3 seconds 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