"brand new and high quality\n\nFeatures:\nThis RW1990 chips we use imported one, which approved to be reliable performance than others, CMOS microcircuit is essentially an electronic for carrier of the unique 64-bit digital code. The code is stored in the internal nonvolatile memory. The data exchange is performed by the protocol 1-Wire, which requires one data pin and the common pin. The microcircuit supports the function of the protocol 1-Wire of ROM search, which makes it possible for several devices to operate on one bus. This protocol determines the alteration conditions of the bus status and the for time intervals during synchronization by the synchropulses cuts of the control device. Data readout and writing are performed by the junior significant bit forward.\n\nTM card, also known as for touch memory, electronic ke3.5y\nStainless steel package with su304#,\nrugged, never rust, corrosion; resistant to heat;\nAnti-variant; sealing strong;\n\nfor security patrol, sauna door locks,electronic door locks,\ndoor intercom, card systems, identification, banking,\nCommunications, rail transportation, transportation, and so many fields\nInformation ibutton RW1990 memory 64, can be repeated rubbing, write the diy code.\n \nSpecifications:\nDimension: 16.25*5.89mm\nChip type: RW1990\nRW1990 feature:\n\n1.RW1990 ibutton\n2.Low-cost\n3.water proof\n4.Rewritable ,DS1990A and TM1990A iButton ,\n5.can be copy,RW1990\n\nTechnique Parameters:\n.America for DALLAS encryption\n.Breakdown Rate:1/100,000\n.Serial Number:Only global 64 bit numbers\n.System Logic:64bits pin for protection\n.Memory:8kb \n.Inductive Type: for touch\n.R/for W and encrypt\n.R/for W times:1,500,000,000\n.Working Temperature:-40~85\n.Lifetime:>20years\n.TM Dimension:16.25*5.89mm\n.Weight: 6g/pc\n\n \nRewritable ibutton RW1990A-F5 read-write type of card, compatible ds1990a.\nRewritable,DS1990A and TM1990A iButton ,RW1990\n\nUnique 64-bit registration Number;\nBuilt-In Multidrop Controller for 1-Wire Net;\nDigital identification by momentary Contact\n\n Note: \n1.Transition: 1cm=10mm=0.39inch\n2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\n3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage includeswithout retail package:\n10pcs x RW1990 Sauna for Key":