The IQ Recessed Sensor is a magnetic contact sensor that provides concealed protection for doors. Hidden within the door frame, this contact is virtually invisible when the door is closed making it ideal when discreet sensors are needed.
Connecting a Door/Window Sensor to an IQ Panel 2
Door/Window Sensor Model QS1135-840 Guide
How to Replace the Batteries in your QS1135-840 Door/Window Sensor
How to Resolve a Tamper Condition on a QS1135-840 Door/Window Sensor
How to Fix a Sensor Malfunction on the IQ Panel 2