# Product expiration The DEXPIRY warranty token system could include information about the product’s expected shelf life, consumables, or expiration date, which is particularly useful for products with limited use—such as batteries, medical devices, chemicals, or food items. Each token would record the production date and automatically calculate the expiration date, and smart contracts could send notifications when the end of its useful life is approaching. By integrating with supply chain systems and user applications, manufacturers and end users could transparently track product durability, plan maintenance or replacement, and prevent the use of defective or obsolete items. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.dexpiry.com/dexpiry_public_eng/extra-use-case-models/product-expiration.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.