Product overview Pack of 10 blue dropshaped key fobs, 125 kHz T5577 compatible Size: 40 x 30 x 4 mm (1.57 x 1.18 x 0.16 inch) Casing: ABS plastic, waterproof and durable Internal: quality copper coil Frequency: 125 kHz Read range: 2.5 to 10 cm (1 to 4 inch) Data retention: approximately 10 years Rewritable and programmable in multiple 125 kHz formats Key benefits Flexible and reusable: Rewritable T5577 tags let you program and reprogram ID numbers to match your existing access control or attendance systems, reducing the need to tags when information changes. Broad compatibility: Works with common 125 kHz ID formats including standard 125 kHz ID and HID WG 125 kHz, and can be customized to 26bit Prox format. Compatible with T5567, T5577, and EM4305 devices and can duplicate EM4100 or TK4100 style ID tags. Compact, durable design: Small dropshaped fobs with an ABS housing and copper coil provide a waterproof, longlasting option that fits easily on key rings. Reliable performance: Stable sensing distance of 2.5 to 10 cm supports consistent reading by proximity readers and access control terminals. Important usage note These tags are blank and do not contain preprogrammed card numbers. They cannot be added directly to RFID locks or read by a card reader until you write data with a 125 kHz RFID card writer. Please program the tags with your reader or writer before deployment. Typical applications Hotel key chains: Program and reprogram guest keys for room access and reuse across stays. Access control and time attendance: Issue to staff for secure door entry and clockin systems; reprogram as personnel changes occur. Event ticketing and membership: Use as reusable admission tokens, membership fobs, or packing cards for equipment and asset tracking. Specifications summary Quantity: 10 pieces per pack Color: Blue Shape: Drop shaped Chip model: T5577 compatible Formats supported: 125 kHz ID format, HID WG 125 kHz format, to 26bit Prox Compatibility: Works with T5567, T5577, EM4305 and can duplicate EM4100 TK4100 style tags Size: 40 x 30 x 4 mm (1.57 x 1.18 x 0.16 inch) Material: ABS plastic; internal copper coil Frequency: 125 kHz Sensing distance: 2.5 to 10 cm (1 to 4 inch) Data storage life: about 10 years What you get Ten blank, reusable blue T5577 125 kHz key fobs ready for programming with a compatible 125 kHz RFID writer.