Add-on sensors for our HVAC Smart Relay Switch (HSRS), RF wireless model. For installations where traditional wire runs are not possible or simply inconvenient. Sold as a set of two (2).

Choose one of the following product generations (see note):

  • GEN2 – Second generation sensor features stanard operating range (100 ft) and requires two (2) AAA batteries (not included). It is auto-addressable (up to 65,000+ possible IDs) and measures 3.25″ x 1.5″ x 0.5″. Includes foam mounting tape and screws.
  • GEN3 – Third generation device is a mini-sensor with higher transmit range (200 ft) and operates on a single 3v lithium coin-cell (included). It is pre-programmed with a unique, fixed address (over 16 million possible IDs) and measures 2.2″ x 1″ x 0.25″. Includes foam mounting tape.
  • Note: The two product generations are not cross-compatible as they operate on different radio frequencies. Therefore, a 2nd generation controller will not accept a 3rd generation sensor. Nor will a 3rd generation controller recognize a 2nd generation sensor.



  • Expandable (up to 8 wireless sensors)
  • Compatible with HSRS system (wireless model)
  • Battery-operated
  • Simple mounting



What’s Included:

  • Door/window transmitters (qty 2)
  • Magnets (qty 2)
  • Double-sided foam tape
  • Screws (GEN2 sensor only)


  • GEN2 requires two (2) AAA batteries, not included. Annual replacement is recommended.
  • GEN3 requires one 3V lithium coin cell, included. Delivers 3 to 5 years of battery life.


Additional Info:



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Weight 1 lbs
Door/window sensor

Wireless mini (GEN3), Wireless classic (GEN2)

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