Abstract: An electronic shelf label system comprises an access point having a first communication module, wherein the first communication module transmits downlink data and receives uplink data wirelessly in a first frequency; a plurality of electronic shelf labels, each having a second communication module, wherein the second communication module receives the downlink data and transmits the uplink data wirelessly in a second frequency; a portable terminal having a third communication module and a scanning module, wherein the scanning module scan an ID information of a product and an ID information of an electronic shelf label, and wherein the third communication module transmits a link information between the product and the electronic shelf label to the access point in the first frequency; and a service daemon, wherein the service daemon receives the uplink data from the access point in a third frequency and receives the link information in the third frequency.

Abstract: A wireless network system utilizing dual frequencies comprises an access point having a first communication module, wherein the first communication module transmits downlink data and receives uplink data wirelessly in a first frequency; a plurality of routers, each having a second communication module, wherein the second communication module receives the downlink data from the access point and transmits the uplink data to the access point wirelessly in the first frequency and transmits the downlink data and receives the uplink data wirelessly in a second frequency; and a plurality of end devices, each having a third communication module, wherein the third communication module receives the downlink data from one of the plurality of routers and transmits the uplink data to the same one of the plurality of routers wirelessly in the second frequency.