10Pcs RW1990 iButton Rewritable TM Cards Electronic Keys for Cards Access System
brand new and

Features:
This RW1990 chips we use imported one, which approved to be reliable than others, CMOS microcircuit is essentially an electronic for 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.

TM card, also known as for touch memory, electronic ke3.5y
Stainless steel package with su304#,
rugged, never rust, ; resistant to heat;
Anti-variant; sealing strong;

for security patrol, sauna door locks,electronic door locks,
door intercom, card systems, identification, banking,
Communications, rail transportation, transportation, and so many fields
Information ibutton RW1990 memory 64, can be repeated rubbing, write the diy code.

Specifications:
Dimension: φ16.25*5.89mm
Chip type: RW1990
RW1990 feature:

1.RW1990 ibutton
2.Low-cost
3.water proof
4.Rewritable ,DS1990A and TM1990A iButton ,
5.can be copy,RW1990

Technique Parameters:
.America for encryption
.Breakdown Rate:1/100,000
.Serial Number:Only global 64 bit numbers
.System :64bits pin for protection
.Memory:8kb
.Inductive Type: for touch
.R/for and encrypt
.R/for times:1,500,000,000
.Working Temperature:-40~85
:>20years
.TM Dimension:φ16.25*5.89mm
.Weight: 6g/pc


Rewritable ibutton RW1990A-F5 read-write type of card, compatible ds1990a.
Rewritable,DS1990A and TM1990A iButton ,RW1990

Unique 64-bit registration Number;
Built-In Multidrop Controller for 1-Wire Net;
Digital identification by momentary Contact

Note:
1.Transition: 1cm=10mm=0.39inch
2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.
3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!

Package includes（without retail package）:
10pcs x RW1990 Sauna for Key