Key Features of TK4100 RFID Cards:

1. Frequency: Operates at 125 kHz, a common frequency for low-cost RFID access control systems.
2. Format: The TK4100 card is typically a key fob or a plastic card, often used for simple identification and access control.
3. Data Storage: It stores a unique identification number (UID) that is transmitted wirelessly when the card is scanned by a reader.
4. Compatibility: Works with access control systems that support the TK4100 or compatible formats.
5. Security: Provides basic security through a unique serial number for each card, but lacks advanced encryption or authentication features.
6. Durability: TK4100 cards are often designed to be durable and can withstand

Technical Specifications:

• Frequency: 125 kHz (Low Frequency)
• Size: 85.6 mm x 54 mm x 0.8 mm (ISO standard card size)
• Material: PVC 
• Operating Temperature: -20°C to +50°C
• Weight: 6.3 grams
• Memory Capacity: 64 bits of read-only memory   
• Chip Type: TK4100 (compatible with EM4100/EM4200)   
• Operating Frequency: 125 kHz  
• Power Source: Powe
• Protocol: ISO10536 (125 kHz EM4100 compatible)  
• Read Range: 0-10 cm  
• Unique ID: 40-bit unique identifier  

Applications:

1. Door Entry Systems: The most common application of TK4100 cards is in door access control. 
2. Multi-door Control: A single card can be programmed to provide access to multiple doors within a building or facility, streamlining security.
3. Employee Clock-In/Out: Employees use their TK4100 cards to clock in and out at work.
4. Parking Lot Control: In some facilities, the TK4100 card can be used to grant access to a parking lot or restricted vehicle areas.
5. Staff Badges: In addition to access control, TK4100 cards can serve as employee ID cards.
6. Visitor Management: Visitors can be issued temporary TK4100 cards for access, allowing them to enter the building or specific areas during their visit.