This document describes the M24LR64-R 64 Kbit EEPROM with password protection and dual interface, which supports a 400 kHz I2C serial bus and the ISO 15693 RF protocol at 13.56 MHz. The product features an I2C interface and a contactless interface, with a 64-bit unique identifier (UID). It supports various read and write modes, password protection, and has over 40 years of data retention capability.