Patent ID: 7889060

Claim:
An active radio tag comprising: a storage unit having stored therein a tag ID; a transmission unit that transmits, by radio, the tag ID in a predetermined signal form; a card holder having the storage unit and the transmission unit built therein and including a card placement section in which a card is to be placed; and a detection unit that detects a card placed in the card holder, wherein when the detection unit detects a card, transmission of the tag ID is allowed and when the detection unit does not detect a card, transmission of the tag ID is prohibited, wherein the card holder includes an operation section, the transmission unit transmits the tag ID in different signal forms for different cases, a case in which the operation section is operated and a case in which the operation section is not operated, when the operation section is operated, if the detection unit detects a card, then transmission of the tag ID in a first signal form is allowed, and if the detection unit does not detect a card, then transmission of the tag ID in the first signal form is prohibited, and when the operation section is not operated, regardless of whether there is a card, transmission of the tag ID in a second signal form is allowed.