I don't know if these technically qualify as gadgets, but they are higher tech than the regular tire valve caps, so to me, they're high tech. They monitor the air pressure in your tires, which is an issue for me, since I need new tires. I tend to have to put air in my vehicle tires every few months, and sometimes more often in the hot Summer temperatures. I have a friend who has been watching some that cost around $100, and those are very high tech. They show the actual pressure levels, which would be really nice, but not worth the extra $98 or so above what I paid for the set I bought. I wasn't sure how well these would work, but I put them on the car yesterday, and I was surprised to see a little red showing on the tire that tends to go low on pressure sooner than the others, so apparently they do work, despite the very low price I paid. Does anyone else use something like this? I think they'll be helpful to me, since stooping down really exacerbates my back issues, and with these, I can tell at a glance whether I need to add air, and if so, to which tires.