An iButton is a computer chip enclosed in a 16mm thick stainless steel can. Because of this unique and durable container, up-to-date information can travel with a person or object anywhere they go. The steel iButton can be mounted virtually anywhere because it is rugged enough to withstand harsh environments, indoors or outdoors. It is small and portable enough to attach to a key fob, ring, watch, or other personal items, and be used daily for applications such as access control to buildings and computers, asset management, and various data logging tasks.

• Ruggedness: Tough enough for everyday wear, iButtons withstand water, dirt, bumps and magnetic fields. You can wear your iButton key in the shower. You can drop it in a puddle in front of the door and still use it to get in.
• Wearability: iButtons fit into many forms of accessories: key fobs, rings, necklaces, watches, badges and tags. This means you can choose how not to lose your keys. Long life. iButtons are also electronically durable.
• Versatility: There are many kinds of iButtons available; the chips inside can have different levels of memory and functionality. One iButton can have multiple other functions and still get you in the door.
• Uniqueness: All iButton keys derive their uniqueness from a globally unique, controlled serial number engraved in silicon, rather than from physical topography. The factory techniques used in making these unique chips are prohibitively difficult to duplicate. Each unique Sync iButton key is registered to one lock, which likewise has a unique serial number. Even if someone with unlimited time and resources were to somehow duplicate the key's electronic serial number, the owner retains ultimate control over key permissions through the Eternity Management Software. Because of this uniqueness, your home or business security is greater with Eternity Locks and iButton keys than with a mechanical system.