US Patent 8662320 Theft deterrent system for product display device

A product display includes a wall member and a support surface coupled to the wall. Merchandise is displayed on the surface. At least one security support arm is pivotally coupled to the support surface and rotates about an axis. A security bar is coupled to the security support arm and extends over at least a portion of the merchandise. A warning device is coupled to the security support arm and activates to provide a warning as the support arm and the security bar rotate between a plurality of positions. The positions provide a multi-stage notification including a first position where no warning is provided, a second position where a first stage warning is provided, and a third position where a second stage warning is provided.