... .Frequency:125khz, 13.56mhz 4.Good quality, OEM 125khz compatible EM ABS key fob (TK4100) details: Water and dust proof and ... 13.56MHz nominalNXP Mifare1 S50, NXP Mifare1 S70, Desfire MF31CD01, Mifare Ultra light, I-code 1,I-code SLI, Ti2048, Ti256 ... , catering, swimming pool, laundry, massage center, recreation center. 125khz compatible EM ABS key fob (TK4100)