The Shure MXCNFCCARD-10PK is a Cards for MXC and MXCW Conference Units - 10 Pack Identifying current and upcoming speakers makes meetings more efficient and productive. When the participant inserts their ID card into a compatible Microflex® Complete (MXC) Digital Conference System or Microflex Complete Wireless (MXCW) Digital Conference System conference unit, they will then be identified by name instead of seat number on conference unit screens and electronic signs.