There are four items concerned; each is a specific model of a wireless alarm detector. Each wireless alarm detector uses passive infrared (PIR) sensors to detect human movement. When movement is detected a signal is wirelessly transmitted to a receiver for the purpose of reporting an intrusion or alarm. The receiver is configured to send this information to the control panel of the alarm system. The four model numbers are the EE1260 Wall mount motion detector which has a detection range of 15.2m, the EE1261 4-element motion detector which has a detection range of 15m, the EE1262 Wall mount motion detector which has a detection range of 12m and the EE1265 Ceiling mount motion detector which has a detection range of 20m. Each is used as a component of a complex commercial alarm system.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N113684