6 Terminal Reed Magnet Surface Door Window Contact Alarm Switch Sensor + Tamper

4 Terminal Reed Door Flush Contact Burglar Alarm Sensor + Tamper + Resistors

Reed Magnet Set Burglar Pencil Flush Door Contact Alarm Switch Sensor

Reed Magnet Set Burglar Surface Door Window Contact Alarm Switch Sensor + Tamper

Mini Surface Magnet Set Aluminium Metal Door Contact Burglar Alarm Switch Sensor

Sensor Spacer For Ring Contact Door Window Alarm Sensor 1/4" 6mm

Solon Security Defender Wireless Door Wedge Alarm White, 120dB

Reed Magnet Set Burglar Door Window Contact Alarm Switch Sensor N/C (Open loop)