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ankle monitor

n. A device that individuals under house arrest or parole are often required to wear to track their location.

Wikipedia
Ankle monitor

An ankle monitor (also known as a tether, or ankle bracelet) is a homing device that individuals under house arrest or parole are often required to wear. At timed intervals, the ankle monitor sends a radio frequency signal containing location and other information to a receiver. If an offender moves outside of an allowed range, the police will be notified. Ankle monitors are designed to be tamper-resistant and can alert authorities to removal attempts, such as cutting the conductive band causing a circuit break.

The most common configuration is a radio-frequency transmitter unit that sends a signal to a fixed location receiving unit in the offender's residence. The residence unit uses either a land line or a cellular network to relay information to a service center computer. If the offender is not at the residence at times stipulated, an alert message is sent to the service center, and then relayed to the supervising probation or parole officer. GPS units are similar in design, but the offender also carries a GPS cell phone unit that receives a signal from the ankle unit, or both functions may be combined into one ankle unit. Persons subject to a restraining order may also be subject to GPS monitoring.

Usage examples of "ankle monitor".

It would be going backward, like trading an ankle monitor for bricks and bars.