Features: C80: Collecting real time speed from GPS satellites Driving time and distance calculation and display Power through vehicle cigarette outlet jack, no professional installation is required Display MPH or KM/h - Simple push button set up Auto adjust brightness through sensor for day & night-time driving Over-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 display Power 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 - Simple Push Button Set up. Auto Adjust Brightness 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. Package Included: 1 x Car HUD Head Up Display About Y03 HUD: Functions: GPS and Beidou dual chips, the speedometer is very accurate, and the speed is refreshed quickly without any delay. Innovative design, with sunshine hood itself, good review even under sun. Plug & Play, after connect power supply, it will work directly, no need any other operation. Large font, clearly visible both during the day and at night. Speed unit is KMH (not support MPH). Wide application, it can work on all cars, trucks, buses, E-scooters, E-bikes. The Device is GPS Digital Speedometer, and speed is collected from satellites. So if tested at home or parking lot, perhaps speed can't display correctly. Please test it on the car outside with good signal. Note: it's speed display ONLY, no other function. Specification: Model: Y03 Screen Size: 2.8 Inch Material: ABS+PC Screen Type: LED Applicable models: Universal for most vehicles Color: Black and Green Package Included: 1 x HUD 1 x Micro USB Cable 1 x Anti-Slip Gel Pad 1 x Manual Do drop