JYJ 5pcs 125kHz EM4100 Waterproof Adjustable Safety Wristbands, Access Wristbands for Gyms, Swimming Pools, Hotels, and Other Facilities

5pcs 125kHz EM4100 waterproof adjustable safety wristbands, access wristbands for gyms, swimming pools, hotels, and other facilities

• The internal ROM of the EM4100 chip stores 10 decimal card number data, which makes the EM4100 card unique.
• When placed in an alternating electromagnetic field with a frequency of 125kHz, the EM4100 card can sense energy and drive it, and the change in its built-in antenna loop can achieve data transmission with the card reader.
• In terms of application areas, EM4100 cards are widely used in various situations that require identity recognition and data reading, such as access control systems, library borrowing, etc.
• Attention: EM4100 can only read and cannot erase