*To qualify for the ONE (1) FREE OPTEX I-OneX T sensor or ONE (1) FREE BEA IXIO-DT1 sensor, purchase must include a DC One Sliding Door Retrofit and ONE (1) FREE OPTEX I-OneX T sensor or ONE (1) FREE BEA IXIO-DT1 Sensor. Offer valid January 1, 2018 through January 31, 2018. Cannot be applied to past purchases. While supplies last. Other restrictions may apply.