That's not high tech. That's literally just a device constantly emitting a high pitched beep. As you grow older, your hearing degrades. Especially if you subje

That's not high tech. That's literally just a device constantly emitting a high pitched beep. As you grow older, your hearing degrades. Especially if you subject yourself to loud noises or loud music (e.g. almost any live concert). The beep the device emits is just outside the hearing range of most adults (kinda like the hum old CRTs sometimes gave off). Unless it's extremely loud it won't cause any damage, and it's less harmful if you can't hear it (because not hearing it means your ears can't pick it up in the first place) but I wonder if there are concerns about noise pollution.