Infrared cards are used in which setting?

• A. Hotels during the day
• B. Hotel lodging after hours
• C. Airports
• D. Office buildings during business hours

Answer: (B)

Infrared cards are a credential used in access control to grant entry to doors and secure areas. They work with readers that detect the card when it’s within range, allowing access without a traditional key.

In a hotel, after-hours access is a common scenario for infrared cards because the front desk may be limited or closed, yet guests still need a secure way to reach their rooms and certain facilities. The card can be programmed to permit entry only to approved areas and can be disabled when the guest checks out or if the card is lost, improving security during quiet hours.

Hotels during the day typically rely on staff to issue keys, airports rely on more complex, multi-factor security, and office buildings during business hours often use different badge systems with varying access rules, so the after-hours hotel use best fits infrared cards.