??????? ???? ??? “???? ?????”? ????? ???? ?? ???? ??????? ??????? ???? ?? ????? ??????? ????? ?? ????? ????????? ??????? ??????? ???????? ????????.????? ?????????? ??? ???? ???????? ?????? ???? ???????? ?? ??????? ??? ??? ?????.???? ????? ???? ????? ????? ???? ?????? ???? ?????..???? ????? ????Battery-operated detectors are uncomplicated to set