Abstract: The present invention provides a system and method of merchandise security. The system includes a security device, comprising at least a first communication interface, configured to be capable of simultaneously communicating with one or more controllers. A controller, comprising at least a second communication interface configured to be capable of communicating with one or more security devices simultaneously. The method uses a controller with system identity number to initialize the security device which directly or indirectly attached to the merchandise, and to operate the initialized device. The present invention can realize communication between the security device and the controller through a wireless channel, in the communication process, through the generation of the system identity number, the security device can simultaneously implement the point-to-point communication and a point-to-surface communication.

Abstract: 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.