falcon indicator lock

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Both the Schlage B571 and Falcon D271 are occupancy indicator deadbolts that read "IN USE" and "VACANT".  The B571 is shown below but the indicator will be identical to the D271 (see Figu...
The replacement for the D871 is the D271.  None of the parts are backwards compatible. D271 description:Thumbturn x Occupancy Indicator Deadbolt thrown or retracted by turn unit only. ...
The Falcon D400 and D800 series (including the D871) were discontinued in 2008.
The Schlage CO-220 is standalone classroom lock down solution with remote fob and visual indicator which allows immediate local lock down by simply pushing the button on the remote fob from anywher...