Allen-bradley 42BA-S2LPAA-A2 Photoelectric sensor

PIC MS-324R/843 Reed contact sensor

Wireless infrared passage detector – with 32 different melodies – for business, hotel and home – white – 1 transmitter and 1 receiver

Door handle alarm, door and window alarm, touch sensor, alarm, door/window sensor, 120 dB, touch sensor, door handle alarm, theft protection

Door and window alarm, door/window sensor, 120 dB touch sensor, door handle, theft alarm, vibration, window burglar alarm, home security

Pack Freezer Door Alarm, Window Security Alarm, 3/15/30/60 Seconds Wireless Refrigerator Alarm, 4 in 1 Door Sensor Doorbell Loud Door Open Alarm, 108 dB

Burglar Security Alarm, Door Window Magnetic Contact Alarm Security System

Door and window alarm, 130 dB wireless door and window detector with remote control and batteries, burglar and theft protection magnetic sensor for home and child safety system

Door and Window Alarm - Set of 4 Wireless Burglar Alarms - Home Security Against Theft - Magnetic Operation

Door Alarm, Door Opening Detector with Powerful Siren, Wireless Magnetic Alarm for Doors and Windows (Pack of 1)

Pack of 120 fabric sanding belts - 13 x 457 mm （P80）

Door and Window Alarms - Set of 4 - Home Security and Burglar Alarms - Magnetic Operation - 120 dB

4 Pack Window Alarm with Wireless Door Magnetic Sensor for Home Security System, Pool Door Alarm

8 Pack Magnetic Window Door Alarms - Wireless Anti-Theft System - With Sensors - White - Batteries Included

WiFi Door Sensor Alarm: Smart Door Window Sensor with 90dB Alarm and App Notification, Wireless Door Open Contact Sensor for Burglar Alarm

Door and Window Alarm - 4x Wireless Intrusion Alarm Pack - Home Security Against Burglary - Magnetic Operation - 100 dB

Pack Freezer Door Alarm, Window Security Alarm, 3/15/30/60 Seconds Wireless Refrigerator Alarm, 4 in 1 Door Sensor Doorbell Loud Door Open Alarm 108dB

Home alarm, Refrigerator and freezer alarm, Door left open, 60-second reminders and more

Set of 2, Infrared photoelectric sensor door opening accessories, single-beam infrared door signal detector, anti-theft alarm, automatic door sensor

Doorstop Alarm, Red Portable Door Lock Alarm, Anti-burglary Doorstop with Alarm, Door Security for Personal Protection at Home, Hotels and Travel (Red, Battery Not Included)

Smart Wi-Fi door sensor, no hub required, wireless door alarm with powerful 130dB siren and real-time notifications on your smartphone.