A wireless charger for charging a chargeable device , the wireless charger comprising: a wireless power transmitter configured to generate a wireless charging field in at least one charging region; a transceiver configured to communicate with the chargeable device; and a controller configured to facilitate avoidance of cross connection of the chargeable device in which the chargeable device receives power from the wireless power transmitter while communicating with at least one other wireless charger or in which the chargeable device receives power from the at least one other wireless charger while communicating with the transceiver, wherein the controller is further configured to: detect an impedance change in the wireless charging field due to the chargeable device entering the wireless charging field, evaluate the detected impedance change to determine whether the detected impedance change has a predetermined attribute; accept out-of-band communication signals from the chargeable device during a first predetermined period of time after the controller detects the impedance change in the wireless charging field having the predetermined attribute; and decline to accept out-of-band communication signals for a second period of time upon no impedance change being detected; characterized in that the controller is further configured to accept out-of-band communication signals during a third predetermined period of time after detecting an impedance change not having the predetermined attribute. a wireless power transmitter configured to generate a wireless charging field in at least one charging region; a transceiver configured to communicate with the chargeable device; and a controller configured to facilitate avoidance of cross connection of the chargeable device in which the chargeable device receives power from the wireless power transmitter while communicating with at least one other wireless charger or in which the chargeable device receives power from the at least one other wireless charger while communicating with the transceiver, wherein the controller is further configured to: detect an impedance change in the wireless charging field due to the chargeable device entering the wireless charging field, evaluate the detected impedance change to determine whether the detected impedance change has a predetermined attribute; accept out-of-band communication signals from the chargeable device during a first predetermined period of time after the controller detects the impedance change in the wireless charging field having the predetermined attribute; and decline to accept out-of-band communication signals for a second period of time upon no impedance change being detected; characterized in that the controller is further configured to accept out-of-band communication signals during a third predetermined period of time after detecting an impedance change not having the predetermined attribute. detect an impedance change in the wireless charging field due to the chargeable device entering the wireless charging field, evaluate the detected impedance change to determine whether the detected impedance change has a predetermined attribute; accept out-of-band communication signals from the chargeable device during a first predetermined period of time after the controller detects the impedance change in the wireless charging field having the predetermined attribute; and decline to accept out-of-band communication signals for a second period of time upon no impedance change being detected; characterized in that the controller is further configured to accept out-of-band communication signals during a third predetermined period of time after detecting an impedance change not having the predetermined attribute. <EOS>