A new gadget repels gangs of teenagers by emitting a high-pitched noise that can be heard only by under 20s.
Police are backing the Sonic Teenager Deterrent, nicknamed the Mosquito because of its sound, reports the Daily Telegraph.
It annoys teenagers so intensely they have to clutch their ears. Eventually they can stand it no longer and have to move on.
A quick word on blocking ads
It looks like you are using an ad blocker. That's okay. Who doesn't? But without advertising revenue, we can't keep making this site awesome. Click the link below for instructions on disabling adblock.
