An access card (sometimes called a key card, badge, or “fob”) is a plastic card with electronics (RFID or NFC) that communicates with the door reader.
- When you hold it to the reader, the system checks whether the cardholder has permission.
- If yes → the door unlocks. If not → access is denied.
An access card works like a key, but it’s easier to manage and more secure.
Why do companies use access cards instead of keys?
1. Security
- A lost key = you may need to rekey or replace locks.
- A lost card can simply be deactivated and replaced.
2. Granular access control
- Each employee’s card is programmed only for the areas they need.
- Managers can define who can enter the warehouse, server room, or offices.
3. Audit trail and visibility
- The system logs who entered and when.
- This helps investigate security incidents and support time and attendance tracking.
4. Convenience
- No more carrying a heavy keyring.
- One card/fob works for all doors, turnstiles, or parking gates.
What types of access cards and fobs exist?
- RFID card – the most common option, a contactless plastic card.
- Key fob – a small token carried on a keychain.
- Smart card – can combine door access with other functions (e.g., PC login).
- Mobile credential – a newer option using a phone app instead of plastic.
Our practical experience from SMBs with access cards and key fobs
In small and mid-sized businesses, it’s common to combine the building access card with the employee ID badge, or even replace the badge entirely. In this setup, an employee gets one card that serves as both a door access credential and a company ID.
- In companies with tighter security, access badges and employee IDs are combined, typically using RFID, proximity cards (prox cards), or contactless smart card technology.
- In smaller businesses with more informal security, the card may be used only for door access and might not include a photo or other visual ID—so it’s treated purely as a key card or key fob, but it still represents the employee’s digital identity within the system.