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.