Abstract: The invention relates to an optical signalling device, more particularly for an article of clothing, consisting of at least two actively illuminating light sources 5, which are preferably designed to emit light of different colors and are connected to a control circuit 3 for activating the light sources 5 in a predetermined rhythm, the control circuit 3 being connected to a switch, key 2 or the like for its manual activation and/or deactivation. To obtain an optical signalling device which can be activated not only manually, but also externally, the light sources 5 can be activated manually (switch position I) or by remote control (switch position II). Via the remote control system the light sources 5 can be activated via a receiver 4. As a result, many identical optical signalling devices can be activated simultaneously by a coordinator or automatically at, for example, mass (heavily attended) events, so that an enhanced optical effect is achieved.