A full-duplex wireless voice broadcasting system comprising: an emitting device, said emitting device comprising: a first voice sampling/reconstructing unit; a first local network unit, said first local network unit being connected with said first voice sampling/reconstructing unit, said first local network unit comprising a ZigBee module; a power amplifier, said power amplifier being connected with said ZigBee module of the first local network unit; and a radio frequency antenna, said RF antenna of the first local network unit being connected with said power amplifier; and a first operation unit comprising a first indicating light, said first operation unit being connected with said first local network unit, wherein said emitting device is configured to periodically emit data packages and said data packages contain data selected from a group consisting of voice data and non-voice data; the system further comprising at least one receiving device, said receiving device comprising: a second voice sampling/reconstructing unit; a second local network unit, said second local network unit being connected with said second voice sampling/reconstructing unit, said second local network unit comprising a ZigBee module; and a RF antenna, said RF antenna of the second local network unit being connected with said ZigBee module of the second local network unit; and a second operation unit comprising a registration key for initiating a registration process, a second indicating light and a function key for confirming the registration process and for finishing a manual check-in process, which is performed if the receiving device is booted after the emitting device is booted, said second operation unit being connected with said second local network unit, wherein the first indicating light and the second indicating light are configured to flash during the registration process, wherein the second indicating light is configured to turn on when the function key has to be pressed in order to finish the manual check-in process, wherein, after being connected with said emitting device, said receiving device receives said data packages; and a standby status is maintained between said emitting device and said receiving device, and wherein the emitting device is configured to demand the checked-in receiving device to report receiving qualities, to send a channel changing notice to the receiving device, if the receiving qualities are not good because of interference, and to change the frequency channel according to a channel table and the receiving device is configured to change the frequency channel after receipt of the channel changing notice. an emitting device, said emitting device comprising: a first voice sampling/reconstructing unit; a first local network unit, said first local network unit being connected with said first voice sampling/reconstructing unit, said first local network unit comprising a ZigBee module; a power amplifier, said power amplifier being connected with said ZigBee module of the first local network unit; and a radio frequency antenna, said RF antenna of the first local network unit being connected with said power amplifier; and a first operation unit comprising a first indicating light, said first operation unit being connected with said first local network unit, a first voice sampling/reconstructing unit; a first local network unit, said first local network unit being connected with said first voice sampling/reconstructing unit, said first local network unit comprising a ZigBee module; a power amplifier, said power amplifier being connected with said ZigBee module of the first local network unit; and a radio frequency antenna, said RF antenna of the first local network unit being connected with said power amplifier; and a ZigBee module; a power amplifier, said power amplifier being connected with said ZigBee module of the first local network unit; and a radio frequency antenna, said RF antenna of the first local network unit being connected with said power amplifier; and a first operation unit comprising a first indicating light, said first operation unit being connected with said first local network unit, a second voice sampling/reconstructing unit; a second local network unit, said second local network unit being connected with said second voice sampling/reconstructing unit, said second local network unit comprising a ZigBee module; and a RF antenna, said RF antenna of the second local network unit being connected with said ZigBee module of the second local network unit; and a ZigBee module; and a RF antenna, said RF antenna of the second local network unit being connected with said ZigBee module of the second local network unit; and a second operation unit comprising a registration key for initiating a registration process, a second indicating light and a function key for confirming the registration process and for finishing a manual check-in process, which is performed if the receiving device is booted after the emitting device is booted, said second operation unit being connected with said second local network unit,