The UHF EPCglobal Generation 2 standard allows the commercialized provision of mass adoption of UHF RFID technology for passive smart tags and labels. Main fields of applications are supply chain management and logistics for worldwide use with special consideration of European， US and Chinese frequencies to ensure that operating distances of several meters can be realized. The G2X is a dedicated chip for passive， intelligent tags and labels supporting the EPCglobal Class 1 Generation 2 UHF RFID standard. It is especially suited for applications where operating distances of several meters and high anti-collision rates are required. The G2X is a product out of the NXP Semiconductors UCODE product family. The entire UCODE product family offers anti-collision and collision arbitration functionality. This allows a reader to simultaneously operate multiple labels / tags within its antenna field. A UCODE G2X based label/ tag requires no external power supply. Its contact-less interface generates the power supply via the antenna circuit by propagative energy transmission from the interrogator （reader）， while the system clock is generated by an on-chip oscillator. Data transmitted from interrogator to label/tag is demodulated by the interface， and it also modulates the interrogator’s electromagnetic field for data transmission from label/tag to interrogator. A label/tag can be operated without the need for line of sight or battery， as long as it is connected to a dedicated antenna for the targeted frequency range. When the label/tag is within the interrogator’s operating range， the high-speed wireless interface allows data transmission in both directions. In addition to the EPC specifications the G2X offers an integrated EAS （Electronic Article Surveillance） feature and read protection of the memory content. On top of the specification of the G2XL the G2XM offers 512-bit of user memory