Abstract: An alarm device, comprising a so-called alarm tag consisting of two parts arranged so as to be placeable each on one side of an article, for example an article of clothing, of fur or other article, where a needle is provided to extend from one part through the article to the second part, which alarm tag comprises devices for receiving a magnetic alternating field emitted to the alarm tag. According to the invention, the alarm tag (1) comprises devices (8,9,11,12) capable to emit an acoustic signal when the parts (2,3) of the alarm tag (1) move away from each other when the alarm tag (1) is put in a first, active, state and not to emit an acoustic signal when the parts (2,3) of the alarm tag (1) move away from each other when the alarm tag (1) is put in a second, inactive, state.