A device designed to move on would-be criminals has been updated so as not to discriminate against the young.
But it is still being criticised by civil liberty campaigners.
The Mosquito emits a high-pitched sound and has been designed for use in potential crime hotspots such as subways and underground car parks.
The idea is that the noise it produces is so annoying that criminals will not want to hang around.
The Mosquito Mark 4 is a new version of the original Mosquito launched in 2005 - which was criticised for targeting only young people.
That version emitted a noise at such a high frequency that it was usually only audible to those under the age of 25.
Over 3,000 have been sold for use in the UK. Many have been placed outside shops, fast-food outlets and transport hubs - places where owners feel groups of unwanted youths are gathering...for more click here.
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