Use these smart beacons, called Tōd, to track the location of your child, a beloved pet or even your car. Get notifications via email or text when they make an unscheduled departure from the compound or if they wander off too far from you. Having the sensor separate from the phone can, however, do a lot more, like having one on your pet/child to let you know if they get too far away from you, or even putting one on every person in the family to let the others know if they’re home/nearby. Developers can even make add-ons that connect to it and, for example, detect sound, moisture, or anything that you can turn into an electronic signal. This amazing smart phone gadget is available just for $32.