Plug Memory Tokens by Datakey (ATEK Access Technologies LLC) are portable, removable storage devices designed for industrial applications in harsh environments. They feature a flush mount design with a positive locking system, including a foldable stainless steel bail that locks the token in place when turned 45 degrees. The devices offer SPI, I2C, or Microwire interfaces with capacities ranging from 1 Kb to 256 Kb of rewritable EEPROM memory. They utilize corrosion-resistant conductive elastomer contacts for reliable operation and are compatible with IP65-rated KSD Plug receptacles for protection against dust and water ingress. Each token includes a unique, non-changeable 48-bit serial number for device identification.