I will try to answer you as briefly as possible.
First, the offender wears an ankle bracelet. So the device is not visible and may be hidden, but it is definitely there.
Next, the victim, on the other hand, has a device equipped with a panic button, in case of emergency. A radius of action is determined within which the two devices must never be in contact. The number of kilometres of this radius, again, is at the discretion of the judge.
When there is a proximity alert, a call is sent to the central station, which determines whether it is a false alarm or whether a response is appropriate. The alert is then transferred to the police, who send two vehicles: one for the offender, the other for the victim. The offender is then arrested. Obviously, we want everything to happen quickly.
Does this answer your question?