A security tag is provided that includes a housing, an electronic sensor held within the housing, an accessory pin provided with the housing and a lock assembly held within the housing. The accessory is pin provided with the tag housing and may be moveable with respect to the housing between locked and unlocked positions. When the accessory pin is in the locked position, the tag housing is secured to the accessory. When the accessory pin is in the unlocked position, the tag housing is disengaged from the accessory. The lock assembly may include a magnetically influenced (MI) member which is movable from a biased position to a relaxed position in the absence of the selected magnetic field to lock the accessory pins.