Duplicate RFID Fob
Material: ABS
Product Name: Duplicate RFID Key Fob
Frequency: 125kHz
Size: Approx. 40×32mm
Product Overview
The Duplicate RFID Key Fob is a specially designed writable blank keyfob for backing up or replacing existing 125kHz access control credentials.
Normally, there is no engraved number printing on the surface. It requires a compatible RFID duplicator/copy machine to read the ID from an original card and write it to this blank fob.
Built-in rewritable chip (T5577 or EM4305), allowing forced duplication of common low-frequency ID cards without needing property management authorization. Ideal for lost card replacement, personal backups, or spare keys.
Technical Specifications
| Parameter | Details |
|---|---|
| Product Name | Duplicate RFID Key Fob |
| Material | ABS Plastic (Durable & Waterproof) |
| Size | Approx. 40 × 32mm (Customizable) |
| Weight | 5-8g |
| Chip | T5577 / EM4305 (Rewritable) |
| Frequency | 125kHz (Low Frequency) |
| Protocol | Compatible with EM4100, TK4100, HID Prox, etc. |
| Memory | 330 bits (User writable area) |
| Reading Distance | 3-10cm (Depending on reader) |
| Read/Write Cycles | >100,000 times |
| Data Retention | >10 years |
| Operating Temperature | -20°C to +60°C |
| Features | Blank surface (no printed ID), Key ring included, Rewritable |
Chip Options for Bulk Orders
Low Frequency (125kHz) – Recommended for Duplication
| Chip Model | Memory | Features | Best For |
|---|---|---|---|
| TK4100 | Read-only | Standard ID | Original read-only cards |
| EM4200 | Read-only | Compatible | Common access systems |
| T5577 | 330 bits | Rewritable, Password protect | Duplication & backups |
| EM4305 | 512 bits | Rewritable, Compatible T5577 | Duplication, Animal tagging |
| HID Prox | Varies | Proximity compatible | HID systems |
Why Choose T5577/EM4305 for Duplication?
- Rewritable Design: Can be erased and reprogrammed multiple times using a 125kHz RFID copier/duplicator.
- Broad Compatibility: Supports cloning of most common 125kHz ID formats (EM4100, TK4100, etc.).
- Convenient Form Factor: ABS shell with key ring – easy to carry on keys.
- Durability: Waterproof, shock-resistant, suitable for daily use.
- No Pre-Printed ID: Ensures blank state for custom writing.
SYNTEK Duplicate RFID Keyfob vs. Standard Fixed-ID Keyfobs
| Aspect | SYNTEK Duplicate (T5577/EM4305) | Standard Fixed-ID (e.g. EM4100) |
|---|---|---|
| ID Printing | Blank (No engraved number) | Pre-printed or fixed |
| Writable | Yes (Rewritable multiple times) | No (Read-only) |
| Use Case | Backup, replacement, cloning | Original issuance only |
| Flexibility | High (Force duplicate) | Low |
| Success Rate | ~95% (Market common cards) | 100% (If original match) |
| Target Users | Individuals needing spares | Property-issued credentials |
| Price (Bulk) | Competitive for rewritable | Lower for read-only |
| Best Applications | Lost card backup, personal use | Official access control |
Industry Applications
- Residential & Property Management: Backup apartment/community gate access, garage entry.
- Office & Corporate: Spare employee door access keys, visitor temporary badges.
- Parking Lots: Vehicle gate duplication for family members.
- Small Businesses: Independent backup without landlord approval.
- Personal Use: Replacing lost fobs quickly and affordably.
OEM/ODM Customization Options
| Option | Details |
|---|---|
| Color | Blue, Black, Gray, Red (Custom) |
| Shape | Teardrop, Rectangle, Custom mold |
| Logo/Surface | Silk-screen printing, Laser engraving |
| Chip Pre-writing | Optional ID encoding (Bulk orders) |
| Packaging | Poly bags, Custom boxes |
| MOQ | 100 pcs (Lower for standard colors) |
Bulk Order Information
| Order Quantity | Lead Time | Pricing |
|---|---|---|
| 100-1,000 pcs | 7-10 days | Standard quote |
| 1,000-10,000 pcs | 10-15 days | Discounted |
| 10,000+ pcs | 15-25 days | Project pricing |
Standard Packaging: 100 pcs/bag, Carton dimensions approx. 45×35×25cm.
FAQ
Q: Can this duplicate any RFID card?
A: Approximately 95% of common 125kHz ID cards can be duplicated. Encrypted or high-security cards may not work.
Q: Do I need special equipment?
A: Yes, a 125kHz RFID copier/duplicator is required to read and write.
Q: Is it legal to use?
A: Legal for personal backups or replacing your own lost cards. Illegal use is prohibited.
Q: What's the difference from regular keyfobs?
A: This is blank and rewritable – no fixed ID printed.
Q: Can you customize colors/shapes?
A: Yes, contact us for OEM options.
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