Active radio tag, security management system, and security management method

摘要

An active radio tag including a card holder. The card holder has built therein a memory having stored therein a tag ID and a transmission unit that transmits the tag ID by radio. In addition, the card holder includes a card placement section in which a card is to be placed and a card detection switch that detects the card. Only when the placement of the card in the card placement section is detected by the card detection switch, the radio tag is activated and the tag ID is transmitted.