Check the listing for details. X-Small HomeAgain (15 Digit) Microchip with Injector (yellow) (15 ga needle. Condition: New. Listed at 32.65 USD. HomeAgain Pet Recovery System HomeAgain Pet Recovery System has a foolproof ID, record keeping and verification system. HomeAgain Scanner & MIcrochip with injector each sold separately. The national recovery network database is managed by the American Kennel Club.* HomeAgain Pet Recovery System Benefits: gives added protection from theft and fraud increases value and security for your litter unique ID numbers are encoded in the microchip HomeAgain (15 Digit) TempScan Microchip w/ Injector The microchip is about the size of a grain of rice. Pet microchips contain a radio transmitter, an antenna, and a computer chip that is read by a scanner, allowing animal control, vets, or shelters to obtain owners' information in the event a pet gets lost.