DS1990A RW1990 electronic Ibutton keys/ TM1990 dallas Ibutton with Plastic Holder

DS1990A, RW 1990 electronic Ibutton keys / TM1990 dallas Ibutton with Plastic Holder  

TM card is similar to a button battery in shape and can be inlaid into a card, key button and other objects.

You can replace the data line, address line, control line and power line with a single line so that TM card achieves single line communication through a multi -function device.

According to whether the Memory in TM card is encrypted or not, TM card can be divided into encrypted TM card and non-encrypted TM card. Most of TM cards are non-encrypted.

Details of TM Card/Wristband