TK4100 125kHz low-frequency ABS waterproof access control keychain | Compatible with EM4100/EM4200 protocols, supports user-written/rewritten encoding. ABS shell with IP68 waterproof and drop-proof design; keychain form factor for portability and loss prevention. Supports silkscreen logo/laser numbering, suitable for low-frequency access control scenarios such as office building access control, residential gates, parking lots, gyms, and school attendance systems.
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