A Personal area cloaking device was a type of technology developed by the Romulan Star Empire.
In 2380, Alexander Munro of the Hazard team disguised himself as a Romulan in order to infiltrate a Romulan base where he was to meet an informant who turned out to be a female Romulan with a personal area cloaking device. She revealed that it was a prototype technology developed by the Tal Shiar allowing them to cloak their operatives. The informant made use of the device to allow her to hide and protect her identity from the guards in the secret facility. (TNG video game: Elite Force II)