Davis Instruments 8226 CarChip Pro PREVENT REPAIRS: Keep your car in peak running condition and help preempt repairs by tracking over 20 engine performance parameters. EASY-TO-READY: Trip-graphs allow you to track what the driver and car did every second of every trip. Assign trips as personal, commute or business use. GREAT DRIVER TRAINING TOOL: Parents of teens can set audible speed and acceleration alarms. KNOW BEFORE YOU GO: Emissions readiness feature allows you to see how your car will perform before annual vehicle registration. PLUG AND GO! Easy to install and use, requires no tools or automotive expertise!