The units also support interchangeable use of standard serial EEPROM products. The 1 to 32-Mbit keys and tokens have a USB interface and offer write speeds of 1.2 Mbits/sec. Development kits for the reader/writers are also available and contain the reader/writer (USB) with cable, customer-specified Key or Token samples, sample Keyceptacles or Receptacles, software with source code, and user's manual.