Leaky headphones: safety first
Yes, it’s true. This techno-gizmo will set you back a whopping US$49.95 and do nothing to actually protect your ears from potentially damaging sonic waves. But you will know why you have gone deaf thanks to its rapidly flashing red light.
This one doesn’t quite cut it as ‘UsefulTechnology’. Your money would be better spent buying some cotton wool to stuff in your ears.