Card Reader: RFID type ID access control card reader, Reading Distance is about 3-15CM; Support Wiegand 26bits/ Wiegand34bits /ABA Standard Format Data Output. It's widely use for Access control, Parking lot, Campus ID, Time attendance, Hotel Management, Transportation, etc. How to use: When the card approach the reader, The RED LED turn into green, After flashing, then turn RED color again, the buzzer sound shows transmiting data. It has 500mS proximity time distance for card proximity. After finishing card proximity, if the same ID card is still in the proximity range, reader will not transmit the data, neither giving any sound indication, but for different ID card entering proximity area, reader will response continually and send out the data.