???? ????? ??? ????? ?? ????? ????? ???????? ?? ?????? ? ?????? ????????? ?? ?????? ? ?????????.????? ????? ??????? ?????????? ????? ??? ?? ??? ????? ????? ????? ?? ??????? ??????? ??? ?????? ?...???? ?????? ??????? ?? ???? ????? ??? ??????? ? ????? ??? ????? .Battery-operated detectors are uncomplicated to setup, usually needing just a few screws