A display system 10 for displaying information at a point of product display in a retail outlet comprising a communicator 12 for transmitting display information to a remote display module 18, the display module 18 being adapted in a first, low power mode to display information and in a second, higher power mode periodically, in a predetermined manner, to communicate with the communicator 12, the system 10 preferably being configured to enable determination of the accuracy and automated correction of the synchronization of a periodic communication between the communicator 12 and the display module 18 while the display module 18 continues to switch between first and second modes of operation enabling a low overall consumption of power by the display module 18 and more preferably wherein the display module 18 is adapted to switch between first and second power modes between receipt of a synchronization signal and a display information signal from the communicator 12.