The HomeAgain microchip is made out of soda-lyme glass which is sealed and bio-friendly. It has no moving parts or power source. It is the size of a grain of rice and when it is used in conjunction with a microchip scanner, the information in the chip is bounced back to the scanner via a radio frequency much like a “AM/FM radio.” Each microchip has a unique number. This number, along with information about the owner and pet, are added to a national pet registry. Most veterinary hospitals and animal shelters have electronic scanners for detecting and reading these implanted microchips. If a lost pet is found and a microchip is scanned the registry is called and the owner can be contacted.