?Warranty?First time usage, it takes 10-30 seconds to get GPS signal, and it can't work indoor.It's a 2023 new GPS HUD Speedometer with best chipset Beidou and GPS, which can updates seed in each 1 MPH. 24months quality warranty, pls contact with us at anytime. Attention: speed unit is only MPH, can't work in Canada and Mexico. ?On/Off automatically? Built in vibration sensor, when detect car motion, it will be on and display the driving speed in big fonts; if keep stationary 100% for more than 3 minutes, it will be off. When it's off, no power consumption at all, won't drain your car battery. ?Install?Easy install and use, no buttons, no need any setting, no need read manual, plug USB and it will work directly. If your car has a USB port, pls plug the USB cable to USB port; if your car doesn't have a USB port, then give it a car adaptor. ?HUD?Heads Up Display, display the digital driving speed on its own HD display. Compared to normal LED HUD on market, it doesn't need paste any project film on car glass, and it doesn't have double image under sunshine at noon. ?GPS Speedometer?Collects the speed data from GPS satellites, no relation with car engine, no destroy to car circuit board or OBD port, and can be widely used on SUV ATV Pick-up Truck Scooter Golf Cart Bus Boat Train Bike Motorcycle… all vehicles on the market. Attention: speed unit is only MPH, can't work in Canada and Mexico.