Faread FRD77004 is an antenna specially designed for high-performance identification systems in assembly lines. The product has a built-in tunable circuit. When the antenna is installed in different environments and parameter deviations occur, the tuning circuit can be calibrated through fine-tuning to make the product work at its best. Frame antennas are mainly used for mid-range reading of small quantities of tags, such as production automation, package sorting and other fields.