sensor

英 ['sensə] 美['sɛnsɚ]

With a wireless setup, you stick batterypowered sensors up around your home that keep an eye on windows, doors, motion, and more.

The team at Frontpoint addresses the issue in a blog on its site, citing their own jam protection software and claiming that there aren't any documented cases of successful jam attack since the company began offering wireless security sensors in the 1980s.