Product_description: ["DS1990 Series 6 V 1-Wire Smart Card Interface IC - iButton-F5 ***** For more information refer to the specification sheet located in the 'Downloads' section below the image *****", 'The DS1990A-F5+ Serial Number iButton is a rugged data carrier that acts as an electronic registration number for automatic identification. Data is transferred serially through the 1-Wire protocol, which requires only a single data lead and a ground return. Every DS1990A is factory lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability. The durable stainless-steel iButton package is highly resistant to environmental hazards such as dirt, moisture, and shock. Its compact coin-shaped profile is self-aligning with mating receptacles, allowing the DS1990A to be used easily by human operators. Accessories enable the DS1990A to be mounted on almost any object, including containers, pallets, and bags. Applications include access control, work-in-progress tracking, tool management and inventory control.'] (Page 1)