We are looking for tamper - proof UHF RFID tags that work in the 868–900 MHz range. These tags will be placed on metal surfaces like fuel tank caps and will be used in vehicle fuel systems to store and send data such as license plate numbers. Requirements: Frequency: 868–900 MHz (UHF, EPC Class 1 Gen 2 / ISO 18000 - 6C). (Tamper Proof) The tag must stop working or be destroyed if someone tries to remove it. Must work well when mounted on metal surfaces. Must have at least 450 bits of memory that we can read and write. Must be resistant to outdoor conditions (sun, rain, dust). Must handle vibrations and impacts (used on heavy vehicles and machines). Around 30–50 mm in diameter. A low profile is preferred. Can be attached with adhesive, screws, or rivets. It must be firm and permanent. High read sensitivity (better than - 18 dBm). EPC memory of 96 bits or more. Temperature range: - 40°C to +85°C. IP67 or IP68 protection class.