A technique for monitoring a blind spot zone of a motor vehicle is described. According to one aspect, a device comprises at least one sensor or an interface of the at least one sensor, which is designed for detecting objects in the blind spot zone of the motor vehicle; an actuating unit which is designed for setting a turn-signal lamp; and a signal transmitter which is designed for outputting, in the motor vehicle, a first signal for confirming the set turn-signal lamp, and outputting a second signal, which differs from the first signal, from the same signal medium as the first signal, if the at least one sensor detects an object in the blind spot zone of the motor vehicle.