ADVICE : pls choose suitable size for your pets or animals , it is very important . 1.4X8mm microchip it is suitable for Cats and Small Puppies , for Big Bogs ,1.4X8 mm and 2.12X12 mm ,both sizes are ok . 2.12X12mm size microchip , it is suitable for big dogs ,horse , cattles , sheeps, pigs, camels and other big animals , 1.25X7mm size for small fishes , mouses, hamsters, snakes,frog, birds and other very small animals . | Standard: Unique ID code in implant chip detects your pet only.can be read by all pet microchip readers, it comes with 6 barcode stickers for ID number.compliance with international ISO11784/11785 FDX-B standard, universal reader | PROTECT & MANAGE YOUR PETS: Keep your pets safe and protected with our ID tag microchips. With The Manruta microchips ! Our RFID microchip implant gives your pet the best chances of returning home to you if ever lost or stolen. | REGISTRATION:You can go online and find the BEST IN YOUR AREA and register with them "as many and who you wish" and some are free and some are not... and freepetchipregistry website is free