Microchips are passive devices, which means they have no internal energy source. They stay dormant until they are activated by a scanner.:are used by Viaguard.. This microchip is defined by specifications developed by the International Standards Organization or commonly known as ISO. The microchip ID code format for this chip is defined as a 15-digit numeric code that uses 0-9, where the first three digits represent a country code or a manufacturers code. This frequently is considered the “global standard” for pet microchips, and is used by the rest of the pet microchipping world.