E-DCS-PS2: ENVIROMUX plunger-style door-contact sensor 

used to monitor access from sliding doors and windows 

A captive magnet within the plunger activates a reed switch when the plunger is depressed.

• Includes mounting hardware
• For normally closed circuit connection
• Screw terminal
• Compatible with ENVIROMUX 2D/5D/16D; Mini; Micro; 1W