A wireless communication device comprises: an antenna; a radio frequency transceiver, for generating signals for transmission through the antenna, the radio frequency transceiver being connectable to the antenna through a switch; a backscattering block, for generating reflected signals for transmission through the antenna in response to received RF signals, the backscattering block being connectable to the antenna through said switch; and a battery. The switch is controlled by an output voltage of the battery, such that the radio frequency transceiver is connected to the antenna through the switch when the output voltage of the battery exceeds a threshold voltage, and the backscattering block is connected to the antenna through the switch when the output voltage of the battery is below the threshold voltage.