10/20pcs 125khz Rfid Proximity Keyfobs Secure Door Entry Access Control Id Tags. Introducing the 5YOA RFID Keychain, a Versatile and Durable Solution for Your Identification and Access Needs. Crafted from High-quality ABS Material, This Keychain is Designed for Reliability and Longevity. With a Compact Size of Approximately 43.7 X 30.5 X 5.3mm, It is Easy to Carry Around. Operating at a Frequency of 125 KHz and Incorporating the TK4100/EM4100 Chip, This Keychain Offers Seamless Integration with a Variety of Systems Including Public Transportation, Parking, Attendance, and More. Each Keychain Features a Unique, Laser-printed ID and is Equipped with a Convenient Key Ring for Easy Attachment to Your Belongings. Its Impressive Erase Life of 100000 Times Ensures Long-lasting Performance, While the Waterproof Design and Broad Operating Temperature Range (-40 ℃ to 85 ℃) Provide Great Adaptability Across Different Environments. With a Swift Read Time of 0.2 Milliseconds and a Sensing Distance of Up to 5 Cm, This Keychain Delivers Efficient and Quick Identification. Summary of Features: - Brand: 5YOA - Certification: CE - High-concerned Chemical: None - Material: ABS - Size: 43.7 X 30.5 X 5.3mm - Frequency: 125 KHz - Chip Type: TK4100/EM4100 - Erase Life: 100000 Times - Sensing Distance: 0-5 Cm - Read Time: 0.2 Milliseconds - Operating Temperature: -40 ℃ to 85 ℃, Waterproof - Color: Mixed - Applications: Public Transport, Parking, ID Identification, Attendance, Ticketing, Etc. - Includes Key Ring - Pre-programmed with Unique ID Note: This RFID Keychain is Read-only and Not Writable. Ensure Compatibility with Your Device Before Purchase..