You need to remember to have the device reset after you haven't driven your car for several hours. For a moment it will show readings from the last ride, until it updates, this may take a minute or two. It's a little tricky to understand the multifunction buttons, but once you understand them, you'll appreciate the results of this device. especially for the price! I've seen hundreds of other TPMS devices, not sure what they do that this device doesn't have. If you want to keep an eye on your tire pressure and temperature, there's nothing quite as affordable as this device. And I like the fact that it is solar powered.