This large 2.75" x 1.5" tag has an LED screen that scrolls a message with up to 256 characters. Easily program your own message with just some simple key presses of the buttons on the back of the dog tag. You can even adjust the scrolling speed and the brightness of the display. The included silver color chain hangs 15" from the neck. Rhinestone-like jewels surround the metal surface. Uses one easily replaceable CR2032 battery (included).