1Each chip is equipped with an independent syringe for quick and safe injection into the pet's skin surface. 2After aseptic processing, it can be used safely and assuredly and will not cause other adverse effects to your pet. 3Using readable and writable chip, the original data does not need to be written by yourself, and the data can also be changed through a reader (not included). 4Small size and light weight. The proper chip size is 1.4x8mm, suitable for puppies, cats, and other small animals. 5This Pet ID Microchip has a wide range of use and is suitable for most pets, animal husbandry, fish, wild animals, etc.