General description These 50Pcs T5577 Writable 125kHz RFID Key Fob Proximity ID Card Token Tags are designed for creating new and backup RFID tags. They feature rewritable chips that operate in both 125kHz ID format and HID WG 125kHz format, making them versatile for various applications. Technical specifications Frequency: 125kHz Sensing Distance: 2.5 to 10 cm (1 to 4 inches) Data Storage Life: 10 Years Chip Type: T5577 (rewritable chip) Storage Capacity: 330 bits (264 free bits available) Reading Distance: 0 - 10 cm Material: High-quality copper coil inside, ABS plastic casing Color: Black Package Contents: 50 x Key Fob Measurement allowed error: +/- 1-3 cm Compatibility and accessories Requires a 125kHz RFID card writer/copier for data writing Not compatible with ONITY systems and Proxmark3 RDV4 Usage These tags are blank and must be programmed with an ID before use. Ensure you have the appropriate writer to add data to the tags. Other information Waterproof Note: Light reflection