50Pcs 125 Khz Door Access Control RFID Keyfobs Compatible with TK4100

The RFID key tag is made of ABS material. The shell features waterproof, shockproof, and anti-corrosion performance. After multiple manufacturing processes, product quality is well guaranteed. Available in red and blue colors. Each tag includes a key ring for attachment to keys or other items, helping prevent loss. Dimensions: 3.3 x 2.9 x 0.6 cm. Compact size allows carrying in pockets or backpacks. Ergonomic design enhances daily usability. Features TK4100 RFID chip, operating frequency: 125 kHz. Compatible with standard 125 kHz ID access control readers. Each chip has a unique, pre-programmed ID stored both in the chip and printed on the label. The chip is factory-programmed and read-only — it cannot be rewritten or reprogrammed. Not compatible with UHF, MIFARE, or encrypted protocols such as HID Prox, Indala, or others. Designed exclusively for 125 kHz card readers, with reading distance of 0–10 cm. Compatible with various access control applications including door entry systems, hotel locks, employee attendance tracking, school campus access, identity verification, security systems, and parking access. Ideal for use in offices, homes, schools, and residential communities. Support: Read-Only, Not Writable Working Frequency: 125 kHz Size: 29 x 33 x 6 mm Material: ABS Color: Blue, Red Package Contents: 50 x 125 kHz RFID Key Tags