Technology can't help the stupid

I'm always amazed to see product like this one come out: Some new gadget flashes a red light when it's too loud around you. The idea is it's supposed to help you know when to, you know, move the hell away from the ear-piercing noise.
     This is one of those "it looks good on a news release" kind of products, in my opinion. It has one fundamental flaw: You have to have the device with you for it to work. Duh.
     As the article notes, "Say you're near a tractor and worry the noise is loud enough to cause ear damage. Press your thumb on the handheld device's sound port to see whether it's too loud. Likewise, you can press your iPod's ear buds against the port to know whether you ought to turn the volume down."
     Really? Has society gotten this dumb?