US Patent 10140824 Tethered security device for use with an electronic key

A merchandise security device is provided. The merchandise security device may include a base configured to be attached to a support surface. The base includes an alarm circuit and a tether, and the tether is configured to be extended and retracted relative to the base and to be coupled to one or more items of merchandise. The alarm circuit is configured to detect removal of the base from the support surface, cutting of the tether, and/or removal of the tether. In addition, the security device includes a lock mechanism configured to lock to the tether for securing the one or more items of merchandise to the tether, wherein one or more items of merchandise are removable from the tether when the lock mechanism is unlocked.