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What is an iButton
 
The iButton is a computer chip enclosed in a stainless steel container. Each chip has its own unique ID number which is unaffected by magnetic fields, metal detectors, water and most common chemicals.

The steel button is rugged enough to withstand outdoor environments and durable enough for a person to use every day. The silicon chip within the iButton is protected by stainless steel. You can drop it, step on it, scratch it or wear it swimming. The iButton is wear-tested for 10-year durability and can be reassigned quickly and securely. It is by far the best solution for both manufacturing and office environments.