Takex, PA-6820, 66' Vertical Curtain, Dual Element, Up to 16' Ceiling, "Snap In Base", N/O N/C - Selectable, 10.5 to 28VDC
Separate base & sensor head, Pulse Count & Sensitivity adjustment, Silent N/O or N/C selectable output, Tamper Circuit, LED on/off, Alarm Memory, 9V to 18VDC. 66' Vertical curtain Mirror Optic.
For more information, please see 
Data Sheet
