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100pcs/bag RFID key fobs 125KHz proximity ABS key tags hotel key tag access control keyfob TK4100/EM4100 chip Features:100% Brand NewSize:55.03*35.03*5.78mm Material: ABSOperation frequency: 125Khz Detecting distance: 3-10cm Compatible with all Door Entry system Easy to carry Water resistant Each token pre-programmed with unique ID which is printed on it Each comes with Key ring included Compatible with all RFID reader to gain access No external power required. Brand new key inductive card for entrance guard system. TK4100 completely compatible with EM4100,they can replace each other fully. It applies to access control, hotel locks, staff attendance and school campus access and payment control, identification and security systems, parking lot entry and payment, social security management, transportation payment, municipal and ancillary service payment. Package Content:100 x RFID Key-fobs