A signalling device is provided comprising: a warning unit (2) designed to emit perceivable signals correlated with vibrations; a supporting element (6) having a substantially tubular through cavity (8) counter-shaped to a portion of a fishing rod (7); a slit (10) obtained in the supporting element (6) and developing throughout the length of the through cavity (8), the supporting element (6) being elastically deformable to permit expansion of the slit (10); and a connection unit (12) engaging the supporting element (6) to the warning unit (2).
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