... 3.Frequency:125khz, 13.56mhz 4.Good quality, OEM 125khz compatible EM ABS key fob (TK4100) details: Water and dust proof ... nominalNXP Mifare1 S50, NXP Mifare1 S70, Desfire MF31CD01, Mifare Ultra light, I-code 1,I-code SLI, Ti2048, Ti256, Legic mim256 ... *37.5*9.8mm Specials optionsScreen printing logo, serial number-ink jet, laser engravingMain used forAccess control, attendance control, identification, ...