《Lookout Security & Antivirus》App 是其中一個最受歡迎的手機防毒保安 App。
Lookout App 有兩個主要功能。第一是防毒，可以攔阻 Malware, spyware 等，亦會掃描手機檔案。
另一個功能是 Find My Phone，只要配合 lookout.com 網站就可以透過電腦或其他的瀏覽器找尋遺失的手機。但 Find My Phone 有一個限制，就是手機無電，就未能配合運作。
而新推出的 3.0 版本，就增一項名為 Signal Flare 功能。當手機處於低電量時，就會自動記錄手機的當前位置。若手機之後丟失並無電，Find My Phone 功能未能用上，也可有一個手機的最後位置記錄，增加找回手機的機會。
Lost Phone + Dead Battery = No Problem
Dead batteries are a sad fact of mobile life these days. In fact, we found that 30% of people are unable to recover their lost phone because of a dead battery. At Lookout, we got “fired up” to solve this problem! Signal Flare is a first-ever capability that automatically flags your phone’s last known location when the battery gets really low, significantly improving your chances of getting your lost phone back.
除了 Signal Flare外，3.0 版本亦改動了版面的設計，並有 Activity Feed 展示軟件保護手機，攔阻不同病毒威脅等資料。
