???????? ???????? ????? ???????? ????? ????? ????? ????????? ?? ??? ????? ???????? ?? ????? ?? ???? ???? ????? ?????? ??? ???? ????? ?????? ?? ???? ????? ????? ??? ????? ?????????? ????? ??? ????? ?????? ??? ??????? ?????? ????? ?????Battery-operated detectors are effortless to set up, ordinarily needing just a few screws to mount to partitions o