Abstract:
The invention relates to the field of keys for locks and relative accessories. In particular, the invention relates to a device for signalling the opening or closing condition of a lock, comprising a body (2) arranged for being associated with a key (3), or for covering it at least partially or for being incorporated therein, wherein said body comprises: - a selector (4, 5) arranged for reaching two operating positions; - visual signalling means (6', 6") intuitively correctable to the opening or closing condition of said lock, wherein each of the two operating positions of the selector (4, 5) is arranged for cooperating unequivocally with said visual signalling means (6\ 6") to permanently indicate the current condition of the lock.