SURVEILLANCE DEVICE.

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An EAS tag (10) is provided, which includes a body (12) with an internal cavity (16), attachment means (14, 26) for removably attaching the tag (10) to an article, an amorphous metal strip (48) inside the cavity (16) and a permanent magnet (34) inside the housing (12). The permanent magnet (34) is preferably an elongate rare earth magnet and is positioned generally equally far from the ends of the amorphous metal strip (48), preferably in a position spaced laterally from the amorphous strip (48) and generally parallel to the amorphous strip.