... types. (2) Passive, maintenance-free, the service life can reach more than 10 years, and can be ... at most); (4) Fast reading speed (a grade of ms), its a grade of ms, can identify high speed ... Good directivity, directional reading, supports various readers work in a small same area , no mutual interference . (7) ... the reader, ensure the readers sold by a certain integrator cant read the RFID tags issued ...