IButton, also known as TM Touching Memory, is a computer chip packaged in a 16mm thick stainless steel casing. Due to its unique and sturdy casing, it can carry the latest information to any place with people or target objects. In fact, due to the strong enough steel TM card casing to withstand various harsh indoor or outdoor environments, TM cards can be installed almost anywhere. TM cards are very small and lightweight, and can be attached to keychains, ring rings, watches, or other personal items. They are very suitable for controlling access permissions in daily life, such as buildings and computers, asset management, and various data records.