CEDIA ESPA EST Practice Test

Answer - D - You should use the Proximity card if you want to use a reader that does not require a card or key to be inserted.

Key Takeaway: Proximity cards use low-frequency radio signals to communicate. They have a passive RF transmitter that continuously transmits information. When the card is within range of the card reader, the information is received, processed, verified, and signals are passed to the appropriate relay to open or unlock a door or gate. Passive devices do not require a battery to operate. They also do not require the card to be swiped or inserted.