SCM Microsystems Launches Wearable, Wireless Smart Card Reader SCM Microsystems, Inc. has shipped the E-25, the first personal multifunctional smart card reader. SCM developed the E-25 reader to match the new generation of smart cards that offer several different applications on a single card. Slightly bigger than a smart card, the E-25 reader can be kept around a person's neck as a corporate badge or simply attached to a belt.