The utility model relates to an annex equipment, collapsible annex equipment and electronic equipment. This annex equipment includes: a folded plat, the folded plate includes at least one passive information component in relevancy with annex equipment information, and the configuration is for inciting somebody to action annex equipment can attach to electronic equipment's attached mechanism with releasing, electronic equipment includes: the display disposes to detecting annex equipment attaches to electronic equipment's attached detection mechanism can detect the existence and the if and only if of passive information component attached detection mechanism provides annex equipment and electronic equipment and just follows during attached instruction each other passive information component receive information's passive information detection mechanism, and use and follow passive information component received information changes electronic equipment's running state's treater.