Stick-N-Find Bluetooth Tracking Stickers: The StickNFind works by placing a small Bluetooth sticker onto a remote, pet's collar, or even your child's backpack. You can then use your iPhone or Android device to locate the item, causing it to vibrate and light up.
The YellowJacket is an iPhone 4S case that also pulls double duty as a 650,000V stun gun!! Simply activating it will generate a loud and visible spark across the two terminals and could serve as a deterrent to the casual assailant. Should they get closer to you, touching them with the tip of the case will incapacitate even a large male, giving you time to run away to safety.