To ensure resident’s safety in nursing facilities and preventing elopement, especially for elderlies suffering from dementia, our cost-effective anti-wandering system are designed for simultaneously monitoring huge number of residents in the facility reliably and accurately. Our Door Bar Monitor with adjustable sensitivity are optimal for care facilities of different scale, for applying on different exits flexibly, to detect and distinguish any approaching residents wearing our subtle Tag Transmitter and alarming to prevent unaccompanied walking out of nursing homes.