這種事情我也遇到。主要作用是嚇阻，裝了攝像頭後要在醒目的位置貼上牌告，本房有24小時攝像頭監控。見：

https://www.amazon.com/Sheenwang-Property-Trespassing-Surveillance-Aluminum/dp/B07X8MMZ1V/ref=sr_1_2_sspa?crid=2PL00LA8A45J9&keywords=security+signs&qid=1674150644&sprefix=security+%2Caps%2C80&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzRFQxWTBSSk0wMjBYJmVuY3J5cHRlZElkPUEwMzAwNDQwMTA5MlNZUkxZQzAyVSZlbmNyeXB0ZWRBZElkPUExMDE1OTc1M1JFUkVaWFRPMjIxNyZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=