Power saving active tag and reader including the capability of ordinary wake up and of transmission to distance

A wireless tag are provided to minimize the consumption of battery by doing with the on-going basis wake-up and performing the wireless telecommunication when the wireless tag maintains the standby state and the wake up signal is delivered to the outside reader. A wireless tag including processor, the memory and wireless signal transmission unit comprise the detection unit(120) removing the UHF band and extracting the LF signal by detecting this when the outside reader transmits the signal which amplitude-modulates to the UHF frequency band about the LF signal in which the wake up signal is included, and the wake-up unit(140) waking-up one among the processor, the apparatus for transmitting/receiving which detect callincoming unit and the memory if the pattern of both sides coincide with as the result which judges correlation of the signal which is extracted by detecting again the LF signal and the already prepared wake-up pattern.