Abstract: An anti-theft lock for bicycles and other vehicles powered by a person, which lock can be switched over from a locking state into a move state, containing means for tamper-proof attachment of the lock to the vehicle, and a control unit for switching over the lock from the locking state into the move state, and vice versa, is characterized in that the control unit has a receiver for signals of an associated mobile transmitter which are transmitted in a wireless fashion and means for determining the distance of said control unit from the mobile transmitter; the control unit switches over the lock into the locking state if the distance exceeds a threshold value and the vehicle is simultaneously not travelling; and the control unit switches over the lock into the move state if the distance undershoots a threshold value.