Model No SR-820PHW-AC Operating voltage AC110/220V(9V backup battery) Interconnection Install within the radius of 200 m Hush function YES Code form 2262 Sending frequency 433MHz Radio distance 200 m(open area) Sensitivity 2.06%ft±1.3%ft Sound level 85dB/3m Installation Wall or Ceiling mounted Working environment -10~+50(â?¤95%RH No congelation) Dimension 128*38mm
