5 pcs White Recessed Door Contacts NO Security Alarm Door Window Sensors With Magnetic Reed Switch. These ¾” Door Contact Position switches (DCS) Work with All Access Control and Burglar Alarm Systems

These are the door contact sensors that are in use with any and all commercial or residential card access systems as well as all security burglar alarm system. The

ALEKO® 5BS-MC03R-L 5 Sets of Magnetic Contact Reed Switches Security Alarm Contacts For Doors Windows and Other Applications

Product Description: Magnetic Contact sensors can be added to an existing wired Alarm Systems. They are ideal for protecting doors, windows and patio doors and any opening device such

Vinker T-01A DIY Kit 99 Zones Wireless Home and Office Security Alarm System with Auto-Dial, Door Contacts and PIR Motion Sensors, Create a Safe & Intelligent Life for You.

Specification 1). Main Panel Unit/Alarm host • Support Sensors Q’ty: 99pcs sensors ,Total 99 wireless defence Zones, built-in back up battery inside of panel. • Working Ways: Telephone Line