Now I can tell at a glance which tire is having trouble. The onboard system in my car generally warns of a problem with one of the tires. With this device, I now know immediately which tire I need to check. Everything works as described. The alarm sound is loud enough to get your attention even when the radio is loud. An updated manual was emailed to me after my order shipped. This is useful and an improvement over the manual that came with the device. It would be nice if an updated manual was included in the product description. The device as an automatic sleep mode after a period without vibration. Wakes you up when you get in the car. Solar charging is a nice feature of this product and keeps it fully charged. I just have a couple of questions. The display should be brighter in daylight. The display can be read, but requires some concentration. perfect at night. The interface for setting options takes some getting used to. I think it's a safety device that everyone should own and so far I've given it away. I have not currently purchased it for my other car as I use it to tow a trailer and am looking for a monitor that will work with 6 wheels.