We have every right to be paranoid in this crazy world, and that's why preventive types should own the ToteGuard personal alarm to ensure our gadget loaded bag is safe. It's small enough to be carried in your handbag, and loud enough to ward off anyone who tries to steal it. It works by simply hanging it from a table or bar, hanging your purse, and turning on the alarm. Pretty simple, heh? This device is is part of an exhibition at MoMa, but can also be purchased for $25.00. Product Page.