Black Rewritable T5577 Key Fob — Flipper Zero Compatible (125 kHz LF RFID)

The Black Rewritable T5577 key fob is a low-frequency 125 kHz RFID transponder you can read and write with tools like Flipper Zero, Proxmark3, or common 125 kHz writers. Ideal for users who need a reprogrammable, Flipper-compatible T5577 key fob for testing, access control provisioning, and lab use across apartments, offices, hotels, campuses, and parking systems.

Why this T5577 fob?

• Flipper Zero compatible: Program, emulate, and rewrite supported 125 kHz formats using your Flipper.
• Fully rewritable T5577 chipset: Clone or re-provision LF identifiers for legitimate, authorized use.
• Pocket-friendly & durable: Lightweight black keychain form factor built for daily carry.
• Works with most 125 kHz readers: Access control, time & attendance, hotel locks, parking gates, and more.*

Chipset & Physical Specs

• Chip: T5577 rewritable RFID
• Operation frequency: 125 kHz (low frequency)
• Detecting/reading distance: ~3–10 cm (reader-dependent)
• Material: Copper coil + embedded chip in molded housing
• Diameter: ~3 cm (key fob disc)
• Weight: ~1 g
• Power: Passive (no battery required)
• Capabilities: Readable and writable (rewriteable)

Use Cases

Designed for legitimate provisioning and testing across a wide range of 125 kHz systems:

• Door entry / access control and entrance guard systems
• Hotel locks and staff attendance terminals
• School campus access and cashless payment control
• Parking lot entry and payment
• Municipal and ancillary service payment
• Identification and security systems

Flipper Zero & Writer Compatibility

• Programmable with Flipper Zero (125 kHz RFID app), Proxmark3, and many standalone LF writers.
• Compatible with 125 kHz readers in many access control environments.*
• Note: Behavior depends on your target system and how you configure the T5577 blocks.

Important Notes

• 125 kHz only: Not compatible with high-frequency (HF) 13.56 MHz cards (e.g., MIFARE/Desfire) or NFC phones.
• Reader distance varies: Actual range depends on the reader model, antenna size, and environment.
• Authorized use only: Program and duplicate credentials only for systems you own or are explicitly authorized to manage.

*Compatibility depends on the specific access control system and configuration. Some installations use proprietary encoding or keys that may require additional steps or may not be supported.

📩 For any questions, please email us at support@sumokey.com.