The Device
The current UK G4S administered ankle device is made up of a black band, approximately 2.5 cm in width, with an 8 cm long x 3 cm wide grey 'heart'. Along the length of the black strap at the edges run 2 length of fibres which only appear to add strength to the black strap. Additionally, and presumably to record any deliberate cutting of the strap, runs what appears to be a 10-or-so core fibre optic cable which pulses roughly every 1/2 second. Each ankle device has a serial number and a telephone number imprinted on it, should one need to contact the control room.
Read more about this topic: Electronic Tagging
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