The first question many parents ask about the Amber Alert child locator device is just how big of a device it is. Many are concerned that their child will be burdened with keeping up with a bulky item that does not fit well into their pocket. These personal tracking devices are a small 1.77″ x 1.68″ x .78″ so they are perfect for placing in a pocket or even attaching to a lanyard or Velcro bracelet. And though they are not waterproof they are water resistant if your child gets caught out in the rain while wearing the GPS location device.