Anti-Thief: Once opened or cut to steal, Tintin Bag will automatically generate an alarm to remind you.   It is more suitable when you are in a public place, such as, by bus or train, wait in line, eat out, walk and shopping, etc.   Anti-Lost: Once left or taken away by other people by mistake or with intention, Tintin Bag will automatically generate an alarm to remind you. It is more preferable when you attend a meeting or party and things like that. Anti-Robbery:  Once robbed of, Tintin Bag will automatically recognize, and then generate an alarm and send out powerful shockwaves to prevent from being robbed. It is more advisable that if you often walk alone in the evening, or even in the day time.