Best Commercial Door Contacts

Door Chime, METAK Wireless Door Open Contact Sensor Alarm with 500 FT Range, 58 Chimes and 5 Volume Levels for Business/Store/Home/Office When Entering, 1 Transmitter + 1 Plug-in Receiver

SECRUI Door Chime, Wireless Door Chimes When Door Open Entry for Business/Home/Office/Store (500ft Range 32 Chimes Adjustable Volume) Door Ringer Alert Buzzer Alarm with - 1 sensors

SanJie Door Chime, Door Open Contact Sensor Alarm for Business/Store/Home/Office When Entering, with 600 FT Range,55 Chimes 5 Adjustable Volume 2 Receivers +2 Sensors

Seco-Larm SM-4601-L3Q Pack of 6 Industrial Wide-Gap Magnetic Contact Switches, 3" Operation Gap NO/NC, Open/Closed Loop (3 Wires)

Seco-Larm SM-4201-LQ Track-Mount Overhead Door Magnetic Contact Switch, Rugged Aluminum Housing, 36" Wire Leads, for Closed Loop Circuits, 3" Gap, Weatherproof, Mounting Bracket Included

bnafes RC-36 NC+NO Recessed Security Window Door Contact Sensor Alarm Magnetic Reed Switch 2 Sets

Magnetic Reed Switch MC-32 NC Surface Mount Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch White - (6 Sets)

WESUA 5 Pack NC Magnetic Switch Contacts Door Sensor for Home Alarm Security System

Heavy Duty Wired Alarm Garage Door Magnetic Contacts Switch Sensor NC with Adjustable Bracket

Biaungdo 4 Pcs Brown Wired Magnetic Door Window Contact Reed Switch, Surface-Mounted NC Magnetic Door Contact Sensor Alarm Reed Switchfor Window, Cabinet, Wooden Door, with Screws