I first heard about this ingenious little device via a Twitter posting by @oakhampolice
I popped down to see Jon at Oakham Station to find out more. Its really very simple you take your seat off your bike and stuff the little black thing down the hollow tube and it is almost impossible to remove.
The device sends out a unique code, once you have spent your £5, fitted and registered the installation. You wait for your bike to be stolen and if the police find it they can trace the bike back to you. Hopefully it won't be stolen.
Jon also sells a very good bike locks at a reasonable price.
Jon is photo shy and gave me permission to photograph the product and reuse a Leicestershire Police photograph of him standing by his range of security products.
image courtesy of PC J Lloyd Leicestershire Constabulary