An electronic article surveillance system providing wireless data transfer between devices in the system, the wireless data transfer synchronizing the operation of EAS interrogation devices, comprising: a plurality of electronic article surveillance devices (120a - 120g) operating at a system frequency transmitting interrogation bursts at intervals based on the system frequency and adapted for data communication within an EAS network via wired media and/or wireless media; and a synchronization master adapted for communication with the EAS devices via wired media and/or wireless media, the synchronization master including: a master phase-locked loop generating a master synchronization signal based on a master timing source; a master radio transmitter transmitting synchronization data packets to the EAS units, the start of the data packet being synchronized to a zero crossing of the master synchronization signal, and a master radio receiver receiving upstream data packets originating from the EAS units, and memory storage for storing data received from EAS units characterized in that the at least one EAS device is configured to detect the start of the synchronization data packet and interpret the start of the synchronization master data packet as a synchronization burst, and the at least one EAS device further comprises a phase-lock loop generating a local synchronization signal based on the start of the data packet and wherein the master timing source is a three-phase sinusoidal power line signal, and the master phase-lock loop generates the master synchronization signal based on the zero crossings of a sinusoidal power line signal. a plurality of electronic article surveillance devices (120a - 120g) operating at a system frequency transmitting interrogation bursts at intervals based on the system frequency and adapted for data communication within an EAS network via wired media and/or wireless media; and a synchronization master adapted for communication with the EAS devices via wired media and/or wireless media, the synchronization master including: a master phase-locked loop generating a master synchronization signal based on a master timing source; a master radio transmitter transmitting synchronization data packets to the EAS units, the start of the data packet being synchronized to a zero crossing of the master synchronization signal, and a master radio receiver receiving upstream data packets originating from the EAS units, and memory storage for storing data received from EAS units characterized in that the at least one EAS device is configured to detect the start of the synchronization data packet and interpret the start of the synchronization master data packet as a synchronization burst, and the at least one EAS device further comprises a phase-lock loop generating a local synchronization signal based on the start of the data packet and wherein the master timing source is a three-phase sinusoidal power line signal, and the master phase-lock loop generates the master synchronization signal based on the zero crossings of a sinusoidal power line signal. a master phase-locked loop generating a master synchronization signal based on a master timing source; a master radio transmitter transmitting synchronization data packets to the EAS units, the start of the data packet being synchronized to a zero crossing of the master synchronization signal, and a master radio receiver receiving upstream data packets originating from the EAS units, and memory storage for storing data received from EAS units characterized in that the at least one EAS device is configured to detect the start of the synchronization data packet and interpret the start of the synchronization master data packet as a synchronization burst, and the at least one EAS device further comprises a phase-lock loop generating a local synchronization signal based on the start of the data packet and wherein the master timing source is a three-phase sinusoidal power line signal, and the master phase-lock loop generates the master synchronization signal based on the zero crossings of a sinusoidal power line signal.