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The M2K Transponder Coil Ring Detector (T-Ring) is a key ring sized device that can detect the power transmitted by a vehicle's immobilizer system. This can be useful in diagnosing system faults or checking to see if the vehicle is equipped with an immobilizer system. If there is no emitted signal, it will help narrow the fault tracing path. There is no need to try programming a new key or component if the aerial is not working. To use the T-Ring, hold it beside the ignition key against the outer edge of the ignition lock as you turn on the switch. If the system is working, the bright L.E.D. will illuminate when the immobilizer coil powers up to read the transponder key.