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SKU: QS1134-840 Categories: , ,

Qolsys IQ Recessed Door/Window Sensor

Monitor a door or window without letting potential intruders know by installing the Qolsys IQ Wireless S-Line Encrypted Recessed Door/Window Sensor (AKA the IQ Recessed-S). This wireless battery-powered sensor installs into the core of your door to become nearly invisible.

Used with any compatible control panel/receiver (319.5 MHz wireless frequency), such as a GE/Interlogix Panel (NetworX, Simon, etc.) or a Qolsys IQ Panel, the sensor sends intelligent notifications to your panel, like “door left open”. Notifications can be custom-named, so you can know exactly what’s going on. Name notifications for the sensor at your front door, for example, “front door left open”. For each sensor, you can also determine a unique chime type and turn voice prompts On/Off. Additionally, the sensor can be included in automation rules. For example, you could create a rule that adjusts your thermostat when a door is left open.

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SKU: QS1134-840 Categories: , ,


  • Provides intelligent notifications such as “door left open”
  • Compatible with 319.5 MHz wireless panels, such as GE/Interlogix or Qolsys IQ
  • Wireless range up to 600 feet from panel
  • “S-Line” encryption protects signals
  • Built-in tamper switch triggers alert if cover is removed
  • Battery-powered, no wiring required

How It Works

The Recessed Door/Window Sensor consists of two components: the sensor and the magnet. The sensor installs into a 3/4-inch hole drilled into the door/window frame (or the door itself if preferred), and the magnet installs on the door/window itself (or the frame if the sensor is installed in the door). When the sensor detects the magnet has moved more than 1 inch, a notification is triggered.

Additional Features:

  • Using (requires optional subscription), you can get a text if your door or window is left open
  • Triggers alerts for tamper, tamper restore, alarm, alarm restore, and low battery

About S-Line Encryption

Qolsys wireless devices that feature S-Line (“Secure Line”) technology offer advanced encryption to safeguard your wireless signals against hacking.

The technology employs an advanced encryption scheme between the wireless sensor/device and the control panel to ensure that wireless event transmissions are always unique, preventing and eliminating common replay attacks (when an unscrupulous person uses an easy-to-purchase software-defined radio or “listening device” to replay events that were previously sent by wireless devices paired with a security system.) At time of pairing, S-Line technology passes a unique key which enables the encryption algorithm for unique event transmissions, thereby preventing such replay attacks.

We deliver Smart Security. Made Simple.; This happens through our approach to resolving the complexities of multiple platforms/apps while helping the Customer end a world-class home experience with connected smart products and home security via one app and platform that’s easy to use.

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Chorus was recognized as one of the top monitoring companies in the US, being awarded as the 2023 CMS Dealer of the Year.