Velleman proximity card reader velleman vm179 the velleman proximity card reader module can be used for numerous applications in homes and offices where security is needed or to control entry using rfid technology a relay can be activated when a card or fob is in close proximity 100mm to the detection coil the coil can be mounted up to 5m away from the main pcb the proximity card reader is also available in kit form velleman vm179 mounted proximity card reader