The device is designed for commanding the traffic signals with yellow light used for signalling possible dangers on the roads by flashing light .

The device, that can be supplied in two versions, L1 or L2, can command one or two flashing signals alternatively at 1Hz frequency (60 start-up per minute).  The unit can be supplied with or without housing for outside installation (L1 and L2 – without housing; L1S and L2S with housing).