Improved systems and techniques are disclosed for controlling the security states of anti-theft security systems such as product display assemblies using security fobs. According to an example embodiment, a manager security fob and another security fob that is to be authorized for use in controlling the security status of a product display assembly can interact with a system in accordance with a defined sequence to add the another security fob to an authorization list for the product display assembly. For example, the defined sequence can be a connection of the manager security fob with the system, followed by a disconnection of the manager security fob from the system, followed a connection of the another security fob with the system within a defined window.

Embodiments of the present invention are directed to systems and methods for monitoring a status of a plurality of a merchandise display devices for displaying items of merchandise at respective display positions. For example, the method includes monitoring for a change in a preselected characteristic of a circuit defined by an electrical connection between the security devices and a plurality of nodes and between the nodes and an alarm unit. The method also includes determining whether an item of merchandise has been added to or removed from a respective display position based on a change in the preselected characteristic.

Embodiments of the present invention are directed to security systems for securing an item of merchandise from theft or unauthorized removal. For example, the security system may include a sensor configured to be coupled to the item of merchandise and a base configured to removably support the sensor and the item of merchandise thereon. The sensor has a generally L-shaped surface for being secured to a portion of the rear and bottom surfaces of the item of merchandise. The base includes a charging circuit for providing power to the sensor and/or the item of merchandise.

A merchandise security system for an electronic item of merchandise is provided. In one example, the merchandise security system includes a continuous alarming power cord comprising at least one electrical conductor. The alarming power cord has a first end adapted to be electrically connected to the electronic item of merchandise and a second end. The merchandise security system also includes a reel for receiving the second end of the alarming power cord and adapted for storing at least a portion of the alarming power cord thereon. In addition, the merchandise security system includes monitoring circuitry in electrical communication with the alarming power cord and configured to detect an interruption in an electrical signal provided to the alarming power cord.

A merchandise display security device for a portable electronic device having a removable component is provided. The merchandise display security device includes a sensor configured to be secured to the portable electronic device and monitoring electronics configured to detect unauthorized removal of the sensor from the portable electronic device. The merchandise display security device also includes a secondary sensor in electrical communication with the monitoring electronics, wherein the secondary sensor includes a flexible component configured to be positioned between the portable electronic device and the removable component. The monitoring electronics is configured to detect unauthorized removal of the removable component in response to movement of the flexible component.

Embodiments of the present invention are directed to merchandise security systems and methods for displaying and protecting an article of merchandise from theft. In one example, the system includes a sensor configured to be secured to the article of merchandise, wherein the sensor includes alarming circuitry. The system also includes a tether comprising a pair of conductors electrically connected to the alarming circuitry, wherein the pair of conductors is configured to transfer power to the sensor and/or to the article of merchandise. In response to power ceasing to be transferred, the alarming circuitry is configured to monitor an electrical signal transmitted through the pair of conductors in order to determine whether the tether has been cut or removed from the sensor.

Disclosed herein are a methods and system for monitoring battery temperature and providing alerts when temperatures are abnormal, comprising: wirelessly receiving temperature measurement data from a single monobloc or a plurality of monoblocs that are electrically connected in series or parallel, wherein a temperature measurement data represent the temperatures inside each of said plurality of monoblocs; calculating a temperature value, T.sub.PDAVE, equal to an average of the temperature measurement data wirelessly received from all the plurality of monoblocs in a battery; calculating a high temperature difference, T.sub.PDH, as an absolute value of the difference between the highest monobloc temperature in the battery and the T.sub.PDAVE; calculating a low temperature difference, T.sub.PDL, as an absolute value of the difference between the lowest monobloc temperature in the battery and the T.sub.PDAVE; and establishing an alert when the T.sub.PDH is greater than a predetermined high temperature threshold.

Improved systems and techniques are disclosed for controlling the security states of anti-theft security systems such as product display assemblies using security fobs. The tasks relating to fob authentication are offloaded to a computer system, and these authentications can be based on identifiers for the different security fobs. The computer system can maintain a list of identifiers for authorized security fobs that is easily updated when new security fobs are added to or existing security fobs are de-authorized from the system.

Described herein are method and systems for detecting an unauthorized removal of a battery. The system comprising: a battery monitor circuit attached to or embedded in the battery; a remote device, wherein the remote device stores instructions that when executed on the remote device cause the remote device to perform operations comprising: receiving, at the remote device, a wireless signal from the battery monitor circuit comprising voltage and temperature data; evaluating, by the remote device, whether the battery is in its expected location by confirming for each battery, which is expected to be present, whether there has been an unexpected interruption in the wireless signal from the battery; providing an alert notification when there has been an unexpected interruption in the wireless signal.

The present invention provides a multi-voltage power supply system for merchandise security, including a sensor configured to be connected to a plurality of merchandise, respectively, and an alarm including at least one interface for connecting the sensor, wherein the alarm is configured to be able to receive power and a safety signal from the sensor; the sensor is configured to be connectable to a power adapter via a power interface and to power the connected merchandise and/or alarm. In the present invention, the sensor is connected to an external power adapter, and the external power adapter supplies power to the sensor, and then the sensor supplies power to other components in a merchandise or an security system, such as the alarm, thereby reducing the input ports of the external power source and enabling the display of the security system more concise.